30条android项目开发技巧总结与经验 30条android项目开发技巧与经验总结

public static Bitmap stringtoBitmap(String string){
	Bitmap bitmap=null; 
	try { 
		byte[]bitmapArray;
		bitmapArray= Base64.decode(string, Base64.DEFAULT);
		bitmap= BitmapFactory.decodeByteArray(bitmapArray, 0, bitmapArray.length); 
	} catch (Exception e) { 
		e.printStackTrace();
	}
	return bitmap;
}

<!--沉浸式状态栏--> 
  <style name="NoActionBarTheme" parent="Theme.AppCompat.Light.NoActionBar"> 
    <!-- Customize your theme here. --> 
    <item name="colorPrimary">@color/colorPrimary</item> 
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item> 
    <item name="colorAccent">@color/colorAccent</item> 
  </style>

  <!--沉浸式状态栏--> 
  <style name="NoActionBarTheme" parent="Theme.AppCompat.Light.NoActionBar"> 
    <!-- Customize your theme here. --> 
    <item name="colorPrimary">@color/colorPrimary</item> 
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item> 
    <item name="colorAccent">@color/colorAccent</item> 
    <item name="android:windowTranslucentStatus">true</item> 
  </style>

getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

//回到桌面 
      Intent intent = new Intent(Intent.ACTION_MAIN); 
      intent.addCategory(Intent.CATEGORY_HOME); 
      intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
      startActivity(intent);

textView.setMovementMethod(ScrollingMovementMethod.getInstance()); 

@Override 
protected void onDestroy() { 
  try { 
    if( webView!=null) { 
      ViewParent parent = webView.getParent(); 
      if (parent != null) { 
        ((ViewGroup) parent).removeView(webView); 
      } 
      webView.stopLoading(); 
      // 退出时调用此方法，移除绑定的服务，否则某些特定系统会报错 
      webView.getSettings().setJavaScriptEnabled(false); 
      webView.clearHistory(); 
      webView.clearView(); 
      webView.removeAllViews(); 
      webView.destroy(); 
    } 
  } catch (Exception e) { 
    e.printStackTrace(); 
  } 
  super.onDestroy(); 
} 

WebSettings webSettings = webView.getSettings(); 
 
//支持获取手势焦点，输入用户名、密码或其他 
webView.requestFocusFromTouch(); 
 
webSettings.setJavaScriptEnabled(true); //支持js 
//webSettings.setPluginsEnabled(true); //支持插件 
 
//设置自适应屏幕，两者合用 
webSettings.setUseWideViewPort(true); //将图片调整到适合webview的大小 
webSettings.setLoadWithOverviewMode(true); // 缩放至屏幕的大小 
 
 
webSettings.setSupportZoom(true); //支持缩放，默认为true。是下面那个的前提。 
webSettings.setBuiltInZoomControls(true); //设置内置的缩放控件。 
//若上面是false，则该WebView不可缩放，这个不管设置什么都不能缩放。 
 
webSettings.setDisplayZoomControls(false); //隐藏原生的缩放控件 
 
webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.SINGLE_COLUMN); //支持内容重新布局 
webSettings.supportMultipleWindows(); //多窗口 
webSettings.setCacheMode(WebSettings.LOAD_DEFAULT); //关闭webview中缓存 
webSettings.setAllowFileAccess(true); //设置可以访问文件 
webSettings.setNeedInitialFocus(true); //当webview调用requestFocus时为webview设置节点 
webSettings.setJavaScriptCanOpenWindowsAutomatically(true); //支持通过JS打开新窗口 
webSettings.setLoadsImagesAutomatically(true); //支持自动加载图片 
webSettings.setDefaultTextEncodingName("utf-8");//设置编码格式 
//允许自动播放多媒体 
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) { 
  webSettings.setMediaPlaybackRequiresUserGesture(false); 
} 
 
//从Android5.0开始，WebView默认不支持同时加载Https和Http混合模式 
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) { 
  webSettings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW); 
} 

Error:Failed to open zip file. 
Gradle's dependency cache may be corrupt (this sometimes occurs after a network connection timeout.) 
Re-download dependencies and sync project (requires network)
Re-download dependencies and sync project (requires network)

<EditText 
  android:id="@+id/et_search" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:imeOptions="actionSearch" 
  android:singleLine="true" 
  android:inputType="text"/> 

etSearch.setOnEditorActionListener(new TextView.OnEditorActionListener() { 
  @Override 
  public boolean onEditorAction(TextView v, int actionId, KeyEvent event) { 
    if (actionId == EditorInfo.IME_ACTION_SEARCH) { 
      initData(); 
      return true; 
    } 
    return false; 
  } 
 
});