下面列出了怎么用android.support.v4.content.ContextCompat的API类实例代码及写法，或者点击链接到github查看源代码。
/**
* 显示邮箱验证验证
*
* @param registerResp
*/
private void showEmailVerifyDialog(RegisterResp registerResp) {
String content = String.format(getString(R.string.email_verify_tip_content), registerResp.getActivateEmailScore());
new MaterialDialog.Builder(this)
.title(getString(R.string.email_verify_tip_title))
.content(content)
.negativeColor(ContextCompat.getColor(this, R.color.et_tip_text_color))
.negativeText(getString(R.string.email_verify_skip))
.onNegative((dialog, which) -> {
// 发送登录成功事件，会关闭 "登录"、"注册"、"忘记密码" 页
EventBus.getDefault().post(new LoginSucEvent());
})
.positiveColor(ContextCompat.getColor(this, R.color.main_blue_color))
.positiveText(getString(R.string.email_verify_verify))
.onPositive((dialog, which) -> {
EmailVerifyActivity
.startActivity(this, UserCache.getDefault().getEmail());
// 发送登录成功事件，会关闭 "登录"、"注册"、"忘记密码" 页
EventBus.getDefault().post(new LoginSucEvent());
})
.show();
}
private void appendEvent(@DrawableRes int icon, String text, int gravity) {
FrameLayout view = (FrameLayout) LayoutInflater.from(this)
.inflate(R.layout.match_event, eventsLayout, false);
TextView textView = view.findViewById(R.id.txt_match_events);
textView.setText(text);
Drawable drawable = ContextCompat.getDrawable(this, icon);
drawable.setBounds(0, 0, iconSize, iconSize);
textView.setCompoundDrawablePadding(iconPadding);
if (gravity == GravityCompat.START) {
textView.setCompoundDrawables(null, null, drawable, null);
} else {
textView.setCompoundDrawables(drawable, null, null, null);
}
LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) view.getLayoutParams();
layoutParams.gravity = gravity;
view.setLayoutParams(layoutParams);
textView.setGravity(gravity);
eventsLayout.addView(view, 0);
eventsTimeline.setVisibility(View.VISIBLE);
eventsScrollView.smoothScrollTo(0, 0);
}
void themeDay() {
themeNr = 1;
mainView.setBackgroundColor(
ContextCompat.getColor(getApplicationContext(), R.color.MiddleDay)
);
btn.setTextColor(Color.WHITE);
contentView.setBackgroundColor(
ContextCompat.getColor(getApplicationContext(), R.color.DarkDay)
);
contentView.setTextColor(
ContextCompat.getColor(getApplicationContext(), R.color.LightDay)
);
if (Build.VERSION.SDK_INT >= 21) {
getWindow().setStatusBarColor(
ContextCompat.getColor(getApplicationContext(), R.color.LightDay)
);
}
if (isMono) {
contentView.setTypeface(Typeface.MONOSPACE);
btn.setTypeface(Typeface.MONOSPACE);
} else {
contentView.setTypeface(Typeface.SANS_SERIF);
btn.setTypeface(Typeface.SANS_SERIF);
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.i(TAG, "called onCreate");
super.onCreate(savedInstanceState);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
setContentView(R.layout.activity_main);
if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
Log.i("permission", "request READ_EXTERNAL_STORAGE");
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA);
}else {
Log.i("permission", "READ_EXTERNAL_STORAGE already granted");
camera_granted = true;
}
mOpenCvCameraView = (CameraBridgeViewBase) findViewById(R.id.java_surface_view);
mOpenCvCameraView.setCvCameraViewListener(this);
}
@Override
public void onLocationChanged(AMapLocation aMapLocation) {
if (aMapLocation.getErrorCode() == 0) {
ContentUtil.NOW_LON = aMapLocation.getLongitude();
ContentUtil.NOW_LAT = aMapLocation.getLatitude();
getNowCity(true);
mLocationClient.onDestroy();
} else {
if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_PHONE_STATE)
!= PackageManager.PERMISSION_GRANTED) {
// 没有权限
View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.pop_loc_list, null);
LocListWindow locListWindow = new LocListWindow(view, MATCH_PARENT, MATCH_PARENT, MainActivity.this);
locListWindow.show();
locListWindow.showAtLocation(tvLocation, Gravity.CENTER, 0, 0);
if (ContentUtil.FIRST_OPEN) {
ContentUtil.FIRST_OPEN = false;
SpUtils.putBoolean(MainActivity.this, "first_open", false);
}
}
getNowCity(true);
mLocationClient.onDestroy();
}
}
@Override
protected void drawableStateChanged() {
super.drawableStateChanged();
if (mTint != null) {
if (mTint.isStateful())
setColorFilter(mTint.getColorForState(getDrawableState(), 0));
else setColorFilter(mTint);
}
Drawable drawable = getBackground();
if (mBackgroundTint != null && drawable != null) {
Drawable wrap = DrawableCompat.wrap(drawable);
wrap = wrap.mutate();
if (mBackgroundTint.isStateful())
DrawableCompat.setTint(wrap, ContextCompat.getColor(getContext(), mBackgroundTint.getColorForState(getDrawableState(), 0)));
else DrawableCompat.setTintList(wrap, mBackgroundTint);
DrawableCompat.setTintMode(wrap, PorterDuff.Mode.SRC_IN);
}
}
/**
* Checks if there is any missing permissions, and
* requests runtime permission if needed.
*/
private void checkAndRequestPermissions() {
// Check for permissions
for (String eachPermission : REQUIRED_PERMISSION_LIST) {
if (ContextCompat.checkSelfPermission(this, eachPermission) != PackageManager.PERMISSION_GRANTED) {
missingPermission.add(eachPermission);
}
}
// Request for missing permissions
if (missingPermission.isEmpty()) {
startSDKRegistration();
} else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
showToast("Need to grant the permissions!");
ActivityCompat.requestPermissions(this,
missingPermission.toArray(new String[missingPermission.size()]),
REQUEST_PERMISSION_CODE);
}
}
/**
* 获取权限。。有些手机很坑，明明是READ_PHONE_STATE权限，却问用户是否允许拨打电话，汗。
*/
private void getPermissions() {
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
return;
}
List<String> sa = new ArrayList<>();
if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE)
!= PackageManager.PERMISSION_GRANTED) {
//申请READ_PHONE_STATE权限。。。。
sa.add(Manifest.permission.READ_PHONE_STATE);
}
if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
sa.add(Manifest.permission.READ_EXTERNAL_STORAGE);
}
if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
sa.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
}
if (sa.size() < 1) {
return;
}
ActivityCompat.requestPermissions(this, sa.toArray(new String[]{}), 1);
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.button_openUrl) {
mTracker.send(new HitBuilders.EventBuilder().setCategory("open url").setAction("click")
.build());
String shareData = mTitle + "\n" + mURL +
"\n\n" + getString(R.string.send_from);
CustomTabsIntent.Builder builder = new CustomTabsIntent.Builder();
Bitmap icon =
BitmapFactory.decodeResource(getResources(), R.drawable.ic_share_white_24dp);
builder.setActionButton(icon, getString(R.string.share),
Utils.createSharePendingIntent(this, shareData));
builder.setToolbarColor(ContextCompat.getColor(this, R.color.main_theme));
CustomTabsIntent customTabsIntent = builder.build();
customTabsIntent.launchUrl(this, Uri.parse(mURL));
} else if (v.getId() == R.id.button_logout) {
mTracker.send(new HitBuilders.EventBuilder().setCategory("logout").setAction("click")
.build());
clearUserData();
startActivity(new Intent(this, LoginActivity.class));
finish();
}
}
/**
* 加载媒体文件夹
*/
protected void loadMediaSets() {
if (getActivity() == null) {
return;
}
if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.WRITE_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQ_STORAGE);
} else {
//从媒体库拿到文件夹列表
ImagePicker.provideMediaSets(getActivity(), getSelectConfig().getMimeTypes(), new MediaSetsDataSource.MediaSetProvider() {
@Override
public void providerMediaSets(ArrayList<ImageSet> imageSets) {
loadMediaSetsComplete(imageSets);
}
});
}
}
@Override
public void showWeather(WeatherPojo weatherPojo) {
Timber.d("show Weather %s", weatherPojo.toString());
textview_main_city.setText(weatherPojo.getName());
textView_main_current_temperature.setText(String.format("%.1f°", weatherPojo.getMain().getTemp()));
textView_main_min_max.setText(String.format("%.1f° %.1f°", weatherPojo.getMain().getTempMin(), weatherPojo.getMain().getTempMax()));
textView_main_conditions.setText(weatherPojo.getWeather().get(0).getDescription());
textView_main_humidity.setText(getString(R.string.humidity) + " " + weatherPojo.getMain().getHumidity() + "%");
String wind_suffix = getResources().getString(R.string.wind_suffix_metric);
if (UnitLocale.getDefault().equals(UnitLocale.Imperial))
wind_suffix = getResources().getString(R.string.wind_suffix_imperial);
textView_main_wind.setText(getString(R.string.wind) + " " + String.valueOf(weatherPojo.getWind().getSpeed()) + wind_suffix);
textView_main_pressure.setText(getString(R.string.pressure) + " " + weatherPojo.getMain().getPressure() + "hPa");
imageView_main_icon.setImageDrawable(ContextCompat.getDrawable(getContext(), getIcon(weatherPojo.getWeather().get(0).getId())));
}
@OptionsItem(R.id.pickFile)
void pickFile() {
int permissionCheck = ContextCompat.checkSelfPermission(this,
READ_EXTERNAL_STORAGE);
if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(
this,
new String[]{READ_EXTERNAL_STORAGE},
PERMISSION_CODE
);
return;
}
launchPicker();
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvLatitude = (TextView)findViewById(R.id.latitude);
tvLongitude = (TextView)findViewById(R.id.longitude);
try {
if (ContextCompat.checkSelfPermission(getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED ) {
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, 101);
}
} catch (Exception e){
e.printStackTrace();
}
}
private void manageBackgroundColor() {
switch (PredatorSharedPreferences.getCurrentTheme(getApplicationContext())) {
case LIGHT:
relativeLayoutAuthenticator.setBackgroundColor(ContextCompat.getColor(getApplicationContext(),
R.color.background_color));
break;
case DARK:
relativeLayoutAuthenticator.setBackgroundColor(ContextCompat.getColor(getApplicationContext(),
R.color.background_color_inverse));
break;
case AMOLED:
relativeLayoutAuthenticator.setBackgroundColor(ContextCompat.getColor(getApplicationContext(),
R.color.background_color_amoled));
break;
}
}
private void prepareViewsAndExit(@NonNull final Runnable exitAction) {
if (!TransitionUtils.supportsActivityTransitions() ||
(fab.getScaleX() == 0f && albumArtDim.getAlpha() == 0f)) {
exitAction.run();
} else {
final boolean isLandscape = getResources().getConfiguration().orientation
== Configuration.ORIENTATION_LANDSCAPE;
// Landscape Now Playing has a dim, so dim the ImageView and send it
if (isLandscape) {
albumArtDim.setAlpha(0f);
albumArt.setColorFilter(
ContextCompat.getColor(this, R.color.translucentBackground),
PorterDuff.Mode.SRC_ATOP);
} else {
// Portrait NowPlaying does not have a dim. Fade out the dim before animating.
albumArtDim.animate().alpha(0f).setDuration(mShortAnimTime).start();
}
fab.animate().scaleX(0f).scaleY(0f).setDuration(mShortAnimTime)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(final Animator animation) {
exitAction.run();
}
}).start();
}
}
private static AlertDialog createDialog(final Context context) {
AppCompatTextView messageTextView = new AppCompatTextView(context);
messageTextView.setTextSize(16f);
messageTextView.setText(context.getString(R.string.download_manager_disabled));
messageTextView.setPadding(50, 50, 50, 0);
messageTextView.setTextColor(ContextCompat.getColor(context, R.color.black));
return new AlertDialog.Builder(context)
.setView(messageTextView)
.setPositiveButton("ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
enableDownloadManager(context);
}
})
.setCancelable(false)
.create();
}
@Override
public void onCreate(Bundle state) {
super.onCreate(state);
// Prepare the data for UI
captions = new HashMap<String, Integer>();
captions.put(KWS_SEARCH, R.string.kws_caption);
captions.put(MENU_SEARCH, R.string.menu_caption);
captions.put(DIGITS_SEARCH, R.string.digits_caption);
captions.put(PHONE_SEARCH, R.string.phone_caption);
captions.put(FORECAST_SEARCH, R.string.forecast_caption);
setContentView(R.layout.activity_main);
((TextView) findViewById(edu.cmu.pocketsphinx.demo.wear.R.id.caption_text))
.setText("Preparing the recognizer");
// Check if user has given permission to record audio
int permissionCheck = ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.RECORD_AUDIO);
if (permissionCheck != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.RECORD_AUDIO}, PERMISSIONS_REQUEST_RECORD_AUDIO);
return;
}
runRecognizerSetup();
}
public void changeBackgroundColor(final View view, int from, int to) {
int colorFrom = ContextCompat.getColor(this, from);
int colorTo = ContextCompat.getColor(this, to);
ValueAnimator colorAnimation = ValueAnimator.ofObject(new ArgbEvaluator(), colorFrom, colorTo);
colorAnimation.setDuration(250); // milliseconds
colorAnimation.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animator) {
view.setBackgroundColor((int) animator.getAnimatedValue());
}
});
colorAnimation.start();
}
private void initDefaultValues() {
mBackButtonColor = mNextButtonColor = mCompleteButtonColor =
ContextCompat.getColorStateList(getContext(), R.color.ms_bottomNavigationButtonTextColor);
mSelectedColor = ContextCompat.getColor(getContext(), R.color.ms_selectedColor);
mUnselectedColor = ContextCompat.getColor(getContext(), R.color.ms_unselectedColor);
mErrorColor = ContextCompat.getColor(getContext(), R.color.ms_errorColor);
mBackButtonText = getContext().getString(R.string.ms_back);
mNextButtonText = getContext().getString(R.string.ms_next);
mCompleteButtonText = getContext().getString(R.string.ms_complete);
}
@Override
public void onItemSwipeMoving(Canvas canvas, RecyclerView.ViewHolder viewHolder, float dX, float dY, boolean isCurrentlyActive) {
if (!isCurrentlyActive) {
BaseViewHolder holder = (BaseViewHolder) viewHolder;
CardView cardView = holder.getView(R.id.cardview);
cardView.setCardBackgroundColor(ContextCompat.getColor(context, R.color.color_primary));
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_friends_search);
toolbar = (Toolbar) findViewById(R.id.toolbar1);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setTitle("Find friends on Zomato");
toolbar.setTitleTextColor(ContextCompat.getColor(context, R.color.white));
recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
allList = new ArrayList<>();
allAdapter = new FriendAdapter(context, allList);
/*allAdapter.setClickListener(new FriendAdapter.ClickListener() {
@Override
public void onItemClickListener(View v, int pos) {
}
@Override
public void onFriendListener(int pos, boolean isFollowing) {
}
});*/
recyclerView.setLayoutManager(new LinearLayoutManager(context));
recyclerView.setNestedScrollingEnabled(false);
recyclerView.setAdapter(allAdapter);
setList();
}
public void runWithPermissionsCheck(int requestCode, String permission, Runnable runnable) {
if (ContextCompat.checkSelfPermission(this, permission) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(this, permission)) {
Toast.makeText(this, "please give me the permission", Toast.LENGTH_SHORT).show();
} else {
ActivityCompat.requestPermissions(this, new String[]{permission}, requestCode);
}
} else {
if (runnable != null) {
runnable.run();
}
}
}
/**
* This drawable is shown when the button is a liked state.
*
* @param resId
*/
public void setLikeDrawableRes(@DrawableRes int resId) {
likeDrawable = ContextCompat.getDrawable(getContext(), resId);
if (iconSize != 0) {
likeDrawable = Utils.resizeDrawable(getContext(), likeDrawable, iconSize, iconSize);
}
if (isChecked) {
icon.setImageDrawable(likeDrawable);
}
}
/**
* 获得运行时权限
*/
private void getRuntimeRight() {
if (ContextCompat.checkSelfPermission(context, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 1);
} else {
openAlbum();
}
}
/**
* Formats the text which will be shown when no challenges exist
*
* @param chart the chart whose no data text will be formatted
*/
public void applyNoDataSettings(Chart chart) {
chart.setNoDataText(mApplication.getString(R.string.chart_no_data_text));
Paint p = chart.getPaint(Chart.PAINT_INFO);
p.setTextSize(NO_DATA_TEXT_SIZE);
Context appContext = mApplication.getApplicationContext();
p.setColor(ContextCompat.getColor(appContext, android.R.color.tertiary_text_light));
}
private void checkPermission() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED
|| ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this,
permissions,
REQUEST_PERMISSIONS);
}else {
scanVideo();
}
}
private void setUpEmojiPopup() {
emojiPopup = EmojiPopup.Builder.fromRootView(activity_product_detail_layout)
.setOnEmojiBackspaceClickListener(new OnEmojiBackspaceClickListener() {
@Override public void onEmojiBackspaceClick(final View v) {
Log.d(TAG, "Clicked on Backspace");
}
})
.setOnEmojiClickListener(new OnEmojiClickListener() {
@Override public void onEmojiClick(@NonNull final EmojiImageView imageView, @NonNull final Emoji emoji) {
Log.d(TAG, "Clicked on emoji");
}
})
.setOnEmojiPopupShownListener(new OnEmojiPopupShownListener() {
@Override
public void onEmojiPopupShown() {
emojiButton.setBackground(ContextCompat.getDrawable(ProductDetailActivity.this, R.drawable.ic_keyboard));
}
})
.setOnSoftKeyboardOpenListener(new OnSoftKeyboardOpenListener() {
@Override
public void onKeyboardOpen(final int keyBoardHeight) {
Log.d(TAG, "Opened soft keyboard");
}
})
.setOnEmojiPopupDismissListener(new OnEmojiPopupDismissListener() {
@Override
public void onEmojiPopupDismiss() {
emojiButton.setBackground(ContextCompat.getDrawable(ProductDetailActivity.this, R.drawable.emoji_one_category_people));
}
})
.setOnSoftKeyboardCloseListener(new OnSoftKeyboardCloseListener() {
@Override
public void onKeyboardClose() {
emojiPopup.dismiss();
Log.d(TAG, "Closed soft keyboard");
}
})
.build(commentEmojiconEditText);
}
private void initButton(Context context) {
Drawable normal = ContextCompat.getDrawable(context, R.drawable.bg_normal_shape);
Drawable select = ContextCompat.getDrawable(context, R.drawable.bg_select_shape);
Drawable highlight = ContextCompat.getDrawable(context, R.drawable.bg_highlight_shap);
for (int type : typeSet) {
final StateListImageButton stateListImageButton = stateListImageButtonSparseArray.get(type);
stateListImageButton.addState(StyleTypeStateSpec.StyleTypeState.STATE_NONE, normal);
stateListImageButton.addState(StyleTypeStateSpec.StyleTypeState.STATE_EXIST, select);
stateListImageButton.addState(StyleTypeStateSpec.StyleTypeState.STATE_ACTIVE, highlight);
stateListImageButton.setOnClickListener(new StateListImageButtonOnClickListener(type));
}
}
@Override
public View provideHandleView(ViewGroup container) {
handle = new View(getContext());
int dimen = getContext().getResources().getDimensionPixelSize(R.dimen.custom_handle_size);
handle.setLayoutParams(new ViewGroup.LayoutParams(dimen, dimen));
Utils.setBackground(handle, drawCircle(dimen, dimen, ContextCompat.getColor(getContext(), R.color.custom_handle_color)));
handle.setVisibility(View.INVISIBLE);
return handle;
}
public static boolean checkCameraPermission(Fragment fragment) {
int cameraPermissionState = ContextCompat.checkSelfPermission(fragment.getContext(), CAMERA);
boolean cameraPermissionGranted = cameraPermissionState == PackageManager.PERMISSION_GRANTED;
if (!cameraPermissionGranted) {
fragment.requestPermissions(PermissionsConstant.PERMISSIONS_CAMERA,
PermissionsConstant.REQUEST_CAMERA);
}
return cameraPermissionGranted;
}