自定义AlertDialog.Builder

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AlertDialog.Builder builder = new Builder(MainActivity.this);

zdy = builder.create();

View view1 = View.inflate(getApplicationContext(), R.layout.jikao, null);

zdy.setView(view1);

bar = (ProgressBar) view1.findViewById(R.id.jdt);

textView = (TextView) view1.findViewById(R.id.sz);

zdy.show();

//消失

zdy.dismiss();

//AlertDialog视图

<ProgressBar
        android:id="@+id/jdt"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:focusable="true"
        style="@android:style/Widget.ProgressBar.Horizontal"
        android:progress="0"
        />
      <TextView
        android:id="@+id/sz"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="0%"
        android:textSize="20sp"

//定义AlertDialog的宽高

AlertDialog dialog = builder.create();
dialog.setView(view);
dialog.show();
WindowManager m = getWindowManager();
Display d = m.getDefaultDisplay(); //为获取屏幕宽、高
android.view.WindowManager.LayoutParams p = dialog.getWindow().getAttributes(); //获取对话框当前的参数值
p.height = (int) (d.getHeight() * 0.3); //高度设置为屏幕的0.3
p.width = (int) (d.getWidth() * 0.5); //宽度设置为屏幕的0.5
dialog.getWindow().setAttributes(p); //设置生效

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