Android仿微信网络加载弹出框

<resources 

  <!-- Base application theme. -- 
  <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar" 
    <!-- Customize your theme here. -- 
    <item name="colorPrimary" @color/colorPrimary</item 
    <item name="colorPrimaryDark" @color/colorPrimaryDark</item 
    <item name="colorAccent" @color/colorAccent</item 
  </style 
  <!-- 自定义dialog的样式 -- 
  <style name="CustomDialog" 
    <item name="android:windowFrame" @null</item <!--边框-- 
    <item name="android:windowIsFloating" true</item <!--是否浮现在activity之上-- 
    <item name="android:windowIsTranslucent" false</item <!--半透明-- 
    <item name="android:windowNoTitle" true</item <!--无标题-- 
    <item name="android:windowBackground" @drawable/dialog_custom_bg</item <!--背景透明-- 
    <item name="android:backgroundDimEnabled" false</item <!--模糊-- 
    <item name="android:backgroundDimAmount" 0.6</item 
  </style 


</resources 

<shape xmlns:android="http://schemas.android.com/apk/res/android"
  android:shape="rectangle" 
  <solid android:color="#ff333333" / 
  <corners android:radius="5dp" / 
</shape 

<?xml version="1.0" encoding="utf-8"? 
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
  android:drawable="@drawable/loading"
  android:fromDegrees="0"
  android:pivotX="50%"
  android:pivotY="50%"
  android:toDegrees="360" 
</rotate 

<!-- 加载对话框布局 -- 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:gravity="center"
  android:orientation="horizontal"
  android:padding="10dp" 

  <ProgressBar
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:indeterminateDrawable="@drawable/indeterminate_drawable"
    android:indeterminateDuration="1800" / 

  <TextView
    android:id="@+id/tvcontent"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:paddingLeft="10dp"
    android:paddingRight="10dp"
    android:text="加载中"
    android:textColor="#ffffff"
    android:textSize="14sp" / 

</LinearLayout 

public class CustomDialog extends Dialog {
  private String content;

  public CustomDialog(Context context, String content) {
    super(context, R.style.CustomDialog);
    this.content=content;
    initView();
  }

  @Override
  public boolean onKeyDown(int keyCode, KeyEvent event) {
    switch (keyCode){
      case KeyEvent.KEYCODE_BACK:
        if(CustomDialog.this.isShowing())
          CustomDialog.this.dismiss();
        break;
    }
    return true;
  }

  private void initView(){
    setContentView(R.layout.dialog_view);
    ((TextView)findViewById(R.id.tvcontent)).setText(content);
    setCanceledOnTouchOutside(true);
    WindowManager.LayoutParams attributes = getWindow().getAttributes();
    attributes.alpha=0.8f;
    getWindow().setAttributes(attributes);
    setCancelable(false);
  }
}

CustomDialog customDialog = new CustomDialog(this, "正在加载...");
customDialog.show();//显示,显示时页面不可点击,只能点击返回
customDialog.dismiss();//消失