Android中创建一个透明的进度对话框实例

首先我们看一下什么叫做透明的进度对话框：

接下来我们讲一下如何创建:
1、使用Eclipse创建一个新的Android 项目，使用Android 2.2或以上。
2、在/res/layout文件夹，创建线性布局activity_main.xml文件,主要是为了添加一个文本标签和一个按钮

复制代码代码如下:

activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

</LinearLayout>

3、在/res/values中打开styles.xml,在这里将添加透明对话框的样式。请务必指定父属性，否则你在运行时会出现问题

复制代码代码如下:

styles.xml
<resources>

<style name="AppBaseTheme" parent="android:Theme.Light">
        
    </style>

<style name="AppTheme" parent="AppBaseTheme">
        
    </style>

<style name="TransparentProgressDialog" parent="@android:Theme.Dialog">
        <item name="android:windowFrame">@null</item>
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowIsFloating">true</item>
        <item name="android:windowContentOverlay">@null</item>
        <item name="android:windowTitleStyle">@null</item>
        <item name="android:windowAnimationStyle">@android:style/Animation.Dialog</item>
        <item name="android:windowSoftInputMode">stateUnspecified|adjustPan</item>
        <item name="android:backgroundDimEnabled">true</item>
        <item name="android:background">@android:color/transparent</item>
    </style>

</resources>

4、在/res中间添加一个动态旋转的动画图片:

5、现在可以实现您的MainActivity.java文件了

复制代码代码如下:

MainActivity.java
package com.authorwjf.transparentprogressdialog;

import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.app.Dialog;
import android.content.Context;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class MainActivity extends Activity implements OnClickListener {

private TransparentProgressDialog pd;
private Handler h;
private Runnable r;

@Override
protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  h = new Handler();
  pd = new TransparentProgressDialog(this, R.drawable.spinner);
  r =new Runnable() {
   @Override
   public void run() {
    if (pd.isShowing()) {
     pd.dismiss();
    }
   }
  };
  findViewById(R.id.the_button).setOnClickListener(this);
}

@Override
public void onClick(View v) {
pd.show();
h.postDelayed(r,5000);
}

@Override
protected void onDestroy() {
  h.removeCallbacks(r);
  if (pd.isShowing() ) {
   pd.dismiss();
  }
  super.onDestroy();
}

}

6、以下是实现透明动画的代码

复制代码代码如下:

private class TransparentProgressDialog extends Dialog {

private ImageView iv;

public TransparentProgressDialog(Context context, int resourceIdOfImage) {
  super(context, R.style.TransparentProgressDialog);
        WindowManager.LayoutParams wlmp = getWindow().getAttributes();
        wlmp.gravity = Gravity.CENTER_HORIZONTAL;
        getWindow().setAttributes(wlmp);
  setTitle(null);
  setCancelable(false);
  setOnCancelListener(null);
  LinearLayout layout = new LinearLayout(context);
  layout.setOrientation(LinearLayout.VERTICAL);
  LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
  iv = new ImageView(context);
  iv.setImageResource(resourceIdOfImage);
  layout.addView(iv, params);
  addContentView(layout, params);
}

@Override
public void show() {
  super.show();
  RotateAnimation anim = new RotateAnimation(0.0f, 360.0f , Animation.RELATIVE_TO_SELF, .5f, Animation.RELATIVE_TO_SELF, .5f);
  anim.setInterpolator(new LinearInterpolator());
  anim.setRepeatCount(Animation.INFINITE);
  anim.setDuration(3000);
  iv.setAnimation(anim);
  iv.startAnimation(anim);
}
}

最后的结果是