Android自定义进度框

有时候，为了适应项目中的统一风格，或者优化进度框的显示效果，我们需要定义自己的进度框显示效果，下面实现一种可添加自己Logo的圆形旋转进度框，代码如下：

1、自定义LoadingDialog类继承Dialog：

package com.example.loadingdialog.view;import com.example.myloadingdialog.R;import android.animation.ObjectAnimator;import android.app.Dialog;import android.content.Context;import android.os.Handler;import android.os.Message;import android.view.Gravity;import android.view.ViewGroup;import android.view.ViewGroup.LayoutParams;import android.view.Window;import android.view.WindowManager;import android.view.animation.LinearInterpolator;import android.widget.ImageView;import android.widget.RelativeLayout;public class LoadingDialog extends Dialog {private ImageView mView;private Context mContext;private ObjectAnimator animator;/** 显示对话框 */private static final int DIALOG_SHOW = 1;/** 隐藏对话框 */private static final int DIALOG_DISMISS = 0;private Handler mHandler = new Handler() {@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case DIALOG_SHOW:LoadingDialog.super.show();break;case DIALOG_DISMISS:LoadingDialog.super.dismiss();break;}}};public LoadingDialog(Context context, int theme) {super(context, theme);mContext = context;RelativeLayout container = new RelativeLayout(mContext);container.setGravity(Gravity.CENTER);ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);mView = new ImageView(context);ImageView iView = new ImageView(context);mView.setBackgroundResource(R.drawable.icon_loading);iView.setBackgroundResource(R.drawable.load_bk);RelativeLayout.LayoutParams params2 = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);params2.addRule(RelativeLayout.CENTER_IN_PARENT, RelativeLayout.TRUE);container.addView(mView, params2);container.addView(iView, params2);setContentView(container, params);setCancelable(true);setCanceledOnTouchOutside(true);Window w = getWindow();WindowManager.LayoutParams lp = w.getAttributes();lp.width = LayoutParams.MATCH_PARENT;}@Overrideprotected void onStart() {super.onStart();animator = ObjectAnimator.ofFloat(mView, "rotation", 0, 360f);animator.setRepeatCount(-1);animator.setDuration(800);animator.setInterpolator(new LinearInterpolator());animator.start();}@Overridepublic void show() {mHandler.sendEmptyMessage(DIALOG_SHOW);}@Overridepublic void dismiss() {mHandler.sendEmptyMessage(DIALOG_DISMISS);}@Overrideprotected void onStop() {animator.end();super.onStop();}}

         注：代码中的两张图片R.drawable.icon_loading和R.drawable.load_bk可根据自己的需求随意替换。

2、在Activity中引用自定义对话框：

package com.example.loadingdialog;import com.example.loadingdialog.view.LoadingDialog;import com.example.myloadingdialog.R;import android.app.Activity;import android.os.Bundle;import android.view.View;public class MainActivity extends Activity {private LoadingDialog dialog;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);dialog = new LoadingDialog(this, R.style.alertdialog_theme);}public void click(View v){dialog.show();new Thread(new Runnable() {@Overridepublic void run() {try {Thread.sleep(10000);dialog.dismiss();} catch (InterruptedException e) {e.printStackTrace();}}}).start();}}

其中初始化自定义对话框时用到了一个自定义样式(res/values/styles.xml)：

<style name="alertdialog_theme" parent="@android:style/Theme.Dialog">        <item name="android:windowIsFloating">true</item>        <!-- 是否浮现在activity之上 -->        <item name="android:windowIsTranslucent">true</item>        <!-- 半透明 -->        <item name="android:windowNoTitle">true</item>        <!-- 无标题 -->        <item name="android:windowBackground">@color/transparent</item>        <!-- 背景透明 -->        <item name="android:backgroundDimEnabled">true</item>        <!-- 模糊 -->    </style>

效果图如下：

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