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...
  @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        inflater.inflate(R.menu.fragment_photo_gallery, menu);

        MenuItem searchItem = menu.findItem(R.id.menu_item_search);
        final SearchView searchView = (SearchView)searchItem.getActionView();

        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {

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private boolean isNetworkAvailableAndConnected() {
        ConnectivityManager cm = (ConnectivityManager)getSystemService(CONNECTIVITY_SERVICE);

        boolean isNetworkAvailable = cm.getActiveNetworkInfo() != null;
        boolean isNetworkConnected = isNetworkAvailable && cm.getActiveNetworkInfo().isConnected();
        return isNetworkConnected;
}

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public abstract class SingleFragmentActivity extends AppCompatActivity {
    protected abstract Fragment createFragment();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fragment);
        FragmentManager fm = getSupportFragmentManager();
        Fragment fragment = fm.findFragmentById(R.id.fragment_container);
        if (fragment == null) {
            fragment = createFragment();

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<?xml version="1.0" encoding="utf-8"?>
<resources>
 <color name="White">#FFFFFF</color>
 <color name="Ivory">#FFFFF0</color>
 <color name="LightYellow">#FFFFE0</color>
 <color name="Yellow">#FFFF00</color>
 <color name="Snow">#FFFAFA</color>
 <color name="FloralWhite">#FFFAF0</color>
 <color name="LemonChiffon">#FFFACD</color>
 <color name="Cornsilk">#FFF8DC</color>

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# Built application files
*.apk
*.ap_

# Files for the ART/Dalvik VM
*.dex

# Java class files
*.class

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File file = new File(System.getProperty("user.home") + "/Downloads/" + "1.jpg");

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100% — FF
95% — F2
90% — E6
85% — D9
80% — CC
75% — BF
70% — B3
65% — A6
60% — 99
55% — 8C

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// with Glide
Glide.with(context)
   .load(url)
   .apply(new RequestOptions().transforms(new CenterCrop(), new RoundedCorners(radius)))
   .into(imageView);

// with Drawable xml

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

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public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE) !=
                PackageManager.PERMISSION_GRANTED){
            Log.i(TAG, "onCreate: 准备申请权限");

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Process:               Vivaldi [1994]
Path:                  /Applications/Vivaldi.app/Contents/MacOS/Vivaldi
Identifier:            com.vivaldi.Vivaldi
Version:               2.0.1309.29 (2.0.1309.29)
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           Vivaldi [1994]
User ID:               502

Date/Time:             2018-09-30 09:57:48.491 +0800