public class CustomDialog extends AlertDialog {
 public CustomDialog(Context context) {
  super(context);
 }

 private TextView tv_loading;
 private ProgressBar progressBar;

 private Timer timer;
 private int count = 1;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.dialog_progress);
  tv_loading = (TextView) findViewById(R.id.tv_loading);
  progressBar = (ProgressBar) findViewById(R.id.pb);

  // 设置Dialog显示的宽度，
  Display d = getWindow().getWindowManager().getDefaultDisplay();
  WindowManager.LayoutParams lp = getWindow().getAttributes();
  //这里设置为屏幕宽度的百分之八十
  lp.width = (int) (d.getWidth() * 0.8);
  getWindow().setAttributes(lp);

  timer = new Timer();
  timer.schedule(new TimerTask() {
   @Override
   public void run() {
    handler.sendEmptyMessage(0);
   }
  }, 300, 300);
  setOnDismissListener(new OnDismissListener() {
   @Override
   public void onDismiss(DialogInterface dialog) {
    if (timer != null) {
     timer.cancel();
    }
   }
  });
 }

 Handler handler = new Handler() {
  @Override
  public void handleMessage(Message msg) {
   count++;
   if (count > 3) {
    count = 1;
   }
   switch (count) {
    case 1:
     tv_loading.setText("加载中.");
     break;
    case 2:
     tv_loading.setText("加载中..");
     break;
    case 3:
     tv_loading.setText("加载中...");
     break;
   }
  }
 };

 public void setProgress(int progress) {
  progressBar.setProgress(progress);
  if (progress == 100) {
   this.dismiss();
  }
 }

}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:background="@drawable/shape_dialog_bg"
 android:orientation="vertical"
 android:padding="10dp">

 <TextView
  android:id="@+id/tv_loading"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_margin="20dp"
  android:text="加载中..."
  android:textSize="16sp" />

 <ProgressBar
  android:id="@+id/pb"
  style="@android:style/Widget.ProgressBar.Horizontal"
  android:layout_width="match_parent"
  android:layout_height="10dp"
  android:max="100"
  android:progressDrawable="@drawable/layer_list_progress_drawable" />


</LinearLayout>

public class MainActivity extends FragmentActivity {


 private CustomDialog customDialog;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  customDialog = new CustomDialog(this);

 }

 private int count = 0;

 public void tvClick(View view) {
  customDialog.show();
  final Timer timer = new Timer();
  timer.schedule(new TimerTask() {
   @Override
   public void run() {
    count += 10;
    runOnUiThread(new Runnable() {
     @Override
     public void run() {
      if (customDialog != null && customDialog.isShowing()) {
       customDialog.setProgress(count);
      }
     }
    });
    if (count >= 100) {
     timer.cancel();
    }
   }
  }, 0, 500);
  customDialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
   @Override
   public void onDismiss(DialogInterface dialog) {
    if (timer != null) timer.cancel();
    count = 0;
   }
  });

 }

}

<TextView
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:layout_gravity="center_horizontal"
  android:clickable="true"
  android:onClick="tvClick"
  android:padding="10dp"
  android:text="点击弹框" />

private String[] scoreText = {". ", ".. ", "..."};
ValueAnimator valueAnimator;

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.dialog_progress);
  tv_loading = (TextView) findViewById(R.id.tv_loading);
  progressBar = (ProgressBar) findViewById(R.id.pb);

  // 设置Dialog显示的宽度，
  Display d = getWindow().getWindowManager().getDefaultDisplay();
  WindowManager.LayoutParams lp = getWindow().getAttributes();
  //这里设置为屏幕宽度的百分之八十
  lp.width = (int) (d.getWidth() * 0.8);
  getWindow().setAttributes(lp);

  if (valueAnimator == null) {
   valueAnimator = ValueAnimator.ofInt(0, 3).setDuration(1000);
   valueAnimator.setRepeatCount(ValueAnimator.INFINITE);
   valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
    @Override
    public void onAnimationUpdate(ValueAnimator animation) {
     int i = (int) animation.getAnimatedValue();
     tv_loading.setText("加载中" + scoreText[i % scoreText.length]);
    }
   });
  }
  valueAnimator.start();
}
//代码省略...