Android透明圆形进度条对话框的设置

首先我们看一下Android自带的圆形进度对话框：

接下来我们讲一下如何创建:
1、使用Eclipse创建一个新的Andr​​oid 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

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">    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:gravity="center_horizontal"        android:padding="8dp"        android:textSize="20sp"        android:text="Transparent Progress Indicator" />    <Button         android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Check it out!"        android:layout_marginTop="40dp"        android:layout_gravity="center"        android:id="@+id/the_button" /></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

styles.xml<resources>    <!--        Base application theme, dependent on API level. This theme is replaced        by AppBaseTheme from res/values-vXX/styles.xml on newer devices.    -->    <style name="AppBaseTheme" parent="android:Theme.Light">        <!--            Theme customizations available in newer API levels can go in            res/values-vXX/styles.xml, while customizations related to            backward-compatibility can go here.        -->    </style>    <!-- Application theme. -->    <style name="AppTheme" parent="AppBaseTheme">        <!-- All customizations that are NOT specific to a particular API-level can go here. -->    </style>    <!--  Transparent dialog -->    <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

MainActivity.javapackage 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

package com.example.circleprogressbar;import android.app.Dialog;import android.content.Context;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;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;import android.widget.TextView;public class TransparentProgressDialog extends Dialog { private ImageView iv; public TransparentProgressDialog(Context context, int resourceIdOfImage) {  super(context, R.style.TransparentProgressDialog);    setTitle(null);    setCancelable(false);    setOnCancelListener(null);    LinearLayout layout = new LinearLayout(context);    layout.setOrientation(LinearLayout.VERTICAL);    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(80, 80);    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