MainActivity:

package com.ruru.dialogproject; import android.app.Activity; import android.os.Bundle; import android.view.View; public class MainActivity extends Activity implements Runnable {  LoadingDialog dialog;  @Override protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.activity_main);   findViewById(R.id.btn_name).setOnClickListener(new View.OnClickListener() {    @Override   public void onClick(View view) {     dialog = new LoadingDialog(MainActivity.this);     dialog.setCanceledOnTouchOutside(false);     dialog.show();     new Thread(MainActivity.this).start();    }   });  }  public void run() {   try {    Thread.sleep(5000);    dialog.dismiss();   } catch (InterruptedException e) {    e.printStackTrace();   }  } }

activity_main:

LoadingDialog:

package com.ruru.dialogproject; import android.app.Dialog; import android.content.Context; import android.os.Bundle; import android.widget.LinearLayout; import android.widget.TextView; /**  * Created by 27c1 on 2017/1/4.  */public class LoadingDialog extends Dialog {  private TextView tv;  /**   * style很关键   */ public LoadingDialog(Context context) {   super(context, R.style.loadingDialogStyle);  }  @Override protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.dialog_loading);   tv = (TextView) findViewById(R.id.tv);   tv.setText("正在上传.....");   LinearLayout linearLayout = (LinearLayout) this.findViewById(R.id.LinearLayout);   linearLayout.getBackground().setAlpha(210);  } }

dialog_loading:

234567891011121314151617181920212223242526272829 
      
       
         
          
         
       
     

R.style.loadingDialogStyle:

drawable-yuanjiao:

效果：

关于样式：

     
      @null
      ：Dialog的windowFrame框为无 
     
      true
     ：是否浮现在activity之上 
     
      false
     :是否半透明 
     
      true
     :是否显示title 
     
      @drawable/dia_bg
     :设置dialog的背景 
     
      true
     背景是否模糊显示 
     
      0.6
     背景的灰度

Window attributes属性详解