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
activity_main.xml
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
@null
@android:color/transparent
true
@null
@null
@android:style/Animation.Dialog
stateUnspecified|adjustPan
true
@android:color/transparent
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.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
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