Android 进度条使用详解及示例代码
在这里，总结一下loading进度条的使用简单总结一下。
一、说起进度条，必须说说条形进度条，经常都会使用到嘛，特别是下载文件进度等等，还有像腾讯QQ安装进度条一样，有个进度总给人良好的用户体验。
先来找图看看，做这个图完成不用图片就可以做到了。
看下xml布局文件，其实就是直接用xml写的在加两个属性设置一下就好了，一个style,另一个是background。
android:id=”@+id/pb_progressbar” style=”@style/StyleProgressBarMini” android:layout_width=”fill_parent” android:layout_height=”wrap_content” android:layout_margin=”30dp” android:background=”@drawable/shape_progressbar_bg” android:max=”100″ android:progress=”50″ /> 先看style吧 这里的progressDrawable又是引用一个自定义drawable，不是图片哦。 shape_progressbar_mini.xml <?xml version=”1.0″ encoding=”utf-8″?> android:angle=”270″ android:centerY=”0.75″ android:endColor=”#FFFFFF” android:startColor=”#FFFFFF” /> android:angle=”270″ android:centerY=”0.75″ android:endColor=”#df0024″ android:startColor=”#df0024″ /> android:angle=”270″ android:centerY=”0.75″ android:endColor=”#de42ec” android:startColor=”#de42ec” /> 再来看看shape_progressbar_bg.xml <?xml version=”1.0″ encoding=”UTF-8″?> android:shape=”rectangle” >
padding：边界的间隔–> android:bottom=”1dp” android:left=”1dp” android:right=”1dp” android:top=”1dp” /> 就这样把一个漂亮的条形进度条做好了，在shape_progressbar_bg.xml中，边框填充的颜色是一种挺好的方法，加了一个进度条的边框。另外为了进度条四个角都是圆形的，就用了这个属性 搞定，这个时候可以开心一下了，去喝杯水先。 二、圆形进度条。另一个比较常用的就是圆形进度条，表示正在进行中。。。 来看2张小图 先看第一张，分析下代码，用自定义的view,用pop来做的哦。LoadingDialog.java public class LoadingDialog { private Context context; private PopupWindow popupDialog; private LayoutInflater layoutInflater; private RelativeLayout layout; private RelativeLayout layout_bg; private View circleView; private RotateAnimation rotateAnim; private AlphaAnimation alphaAnim_in; private AlphaAnimation alphaAnim_out; public LoadingDialog(Context context) { layoutInflater = LayoutInflater.from(context); this.context = context; } private void initAnim() { rotateAnim = new RotateAnimation(0, 360, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); rotateAnim.setDuration(2000); rotateAnim.setRepeatMode(Animation.RESTART); rotateAnim.setRepeatCount(-1); rotateAnim.setInterpolator(new LinearInterpolator()); alphaAnim_in = new AlphaAnimation(0f, 1f); alphaAnim_in.setFillAfter(true); alphaAnim_in.setDuration(200); alphaAnim_in.setInterpolator(new LinearInterpolator()); alphaAnim_out = new AlphaAnimation(1f, 0f); alphaAnim_out.setFillAfter(true); alphaAnim_out.setDuration(100); alphaAnim_out.setInterpolator(new LinearInterpolator()); alphaAnim_out.setAnimationListener(new AnimationListener() { @Override public void onAnimationStart(Animation arg0) { } @Override public void onAnimationRepeat(Animation arg0) { } @Override public void onAnimationEnd(Animation arg0) { dismiss(); } }); } /** * 判断是否显示 * @return */ public boolean isShowing() { if (popupDialog != null && popupDialog.isShowing()) { return true; } return false; } /** * 显示 */ public void show() { dismiss(); initAnim(); layout = (RelativeLayout) layoutInflater.inflate(R.layout.view_loadingdialog, null); circleView = (View) layout.findViewById(R.id.loading_dialog); layout_bg = (RelativeLayout) layout.findViewById(R.id.bgLayout); popupDialog = new PopupWindow(layout, LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT); View parentView = ((Activity) context).getWindow().findViewById(Window.ID_ANDROID_CONTENT); popupDialog.showAtLocation(parentView, Gravity.CENTER, 0, 0); layout_bg.startAnimation(alphaAnim_in); circleView.startAnimation(rotateAnim); } /** * 隐藏 */ public void dismiss() { if (popupDialog != null && popupDialog.isShowing()) { layout_bg.clearAnimation(); circleView.clearAnimation(); popupDialog.dismiss(); } } } 这里呢引用了view_loadingdialog.xml，已作整个页面的背景和loading框。 view_loadingdialog.xml <?xml version=”1.0″ encoding=”utf-8″?> android:layout_width=”match_parent” android:layout_height=”match_parent” > android:id=”@+id/bgLayout” android:layout_width=”match_parent” android:layout_height=”match_parent” android:background=”#66000000″ > android:id=”@+id/loading_dialog” android:layout_width=”48dp” android:layout_height=”48dp” android:layout_centerInParent=”true” android:background=”@drawable/shape_loading_dialog” /> 再看看这个shape_loading_dialog.xml，绘制转动的圆形性状，又不用图片挺好的。 <?xml version=”1.0″ encoding=”utf-8″?> android:shape=”oval” > android:width=”3dp” android:dashWidth=”2dp” android:dashGap=”3dp” android:color=”#fff”/> android:startColor=”#00ffffff” android:endColor=”#00ffffff” android:angle=”180″/> 就是这样子，实现了第一个圆形进度条。 可是如果做有颜色的圆形进度条呢，或者彩色的，后来想想不如加个图片来实现好了。 LoadingImgDialog.java public class LoadingImgDialog { private Context context; private PopupWindow popupDialog; private LayoutInflater layoutInflater; private RelativeLayout layout; private RelativeLayout layout_bg; private int residBg; private View loading_dialog; /** 背景添加旋转动画效果，实现了转动动作 **/ private RotateAnimation rotateAnim; /** 透明度动画效果 **/ private AlphaAnimation alphaAnim_in; private AlphaAnimation alphaAnim_out; public LoadingImgDialog(Context context, int residBg) { layoutInflater = LayoutInflater.from(context); this.residBg = residBg; this.context = context; } private void initAnim() { rotateAnim = new RotateAnimation(0, 360, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f); rotateAnim.setDuration(2000); rotateAnim.setRepeatMode(Animation.RESTART); rotateAnim.setRepeatCount(-1); rotateAnim.setInterpolator(new LinearInterpolator()); alphaAnim_in = new AlphaAnimation(0f, 1f); alphaAnim_in.setFillAfter(true); alphaAnim_in.setDuration(200); alphaAnim_in.setInterpolator(new LinearInterpolator()); alphaAnim_out = new AlphaAnimation(1f, 0f); alphaAnim_out.setFillAfter(true); alphaAnim_out.setDuration(100); alphaAnim_out.setInterpolator(new LinearInterpolator()); /** 监听动作，动画结束时，隐藏LoadingColorDialog **/ alphaAnim_out.setAnimationListener(new AnimationListener() { @Override public void onAnimationStart(Animation arg0) { } @Override public void onAnimationRepeat(Animation arg0) { } @Override public void onAnimationEnd(Animation arg0) { dismiss(); } }); } /** * 判断是否显示 * @return */ public boolean isShowing() { if (popupDialog != null && popupDialog.isShowing()) { return true; } return false; } /** * 显示 */ public void show() { dismiss(); initAnim(); layout = (RelativeLayout) layoutInflater.inflate(R.layout.view_loadingcolordialog, null); loading_dialog = (View) layout.findViewById(R.id.loading_dialog); loading_dialog.setBackgroundResource(residBg); layout_bg = (RelativeLayout) layout.findViewById(R.id.bgLayout); popupDialog = new PopupWindow(layout, LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT); View parentView = ((Activity) context).getWindow().findViewById(Window.ID_ANDROID_CONTENT); popupDialog.showAtLocation(parentView, Gravity.CENTER, 0, 0); layout_bg.startAnimation(alphaAnim_in); loading_dialog.startAnimation(rotateAnim); } /** * 隐藏 */ public void dismiss() { if (popupDialog != null && popupDialog.isShowing()) { layout_bg.clearAnimation(); loading_dialog.clearAnimation(); popupDialog.dismiss(); } } } 其实就是修改了一个地方，加入residBg，用图片资源设置圆形进度条那一小部分的背景。 稍稍修改一句代码换一张图片，就变成了另一个圆形进度条了，好玩吧。 loadingColorDialog = new LoadingImgDialog(this, R.drawable.img_loading); loadingColorDialog2 = new LoadingImgDialog(this, R.drawable.img_loading2); 给看看全屏效果图吧，就稍稍修改一句代码换一张图片哦。 最后给MainActivity.java看看 public class MainActivity extends Activity implements OnClickListener { Button bt_loading_dialog; Button bt_color_loading_dialog; Button bt_color_loading_dialog2; LoadingDialog loadingDialog; LoadingImgDialog loadingColorDialog; LoadingImgDialog loadingColorDialog2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } private void initView() { bt_loading_dialog = (Button) findViewById(R.id.bt_loading_dialog); bt_loading_dialog.setOnClickListener(this); bt_color_loading_dialog = (Button) findViewById(R.id.bt_loading_img_dialog); bt_color_loading_dialog.setOnClickListener(this); bt_color_loading_dialog2 = (Button) findViewById(R.id.bt_loading_img_dialog2); bt_color_loading_dialog2.setOnClickListener(this); loadingDialog = new LoadingDialog(this); loadingColorDialog = new LoadingImgDialog(this, R.drawable.img_loading); loadingColorDialog2 = new LoadingImgDialog(this, R.drawable.img_loading2); } @Override public void onClick(View view) { switch (view.getId()) { case R.id.bt_loading_dialog: loadingDialog.show(); break; case R.id.bt_loading_img_dialog: loadingColorDialog.show(); break; case R.id.bt_loading_img_dialog2: loadingColorDialog2.show(); break; default: break; } } @Override protected void onDestroy() { super.onDestroy(); loadingColorDialog.dismiss(); } @Override public void onBackPressed() { if (loadingDialog.isShowing()) { loadingDialog.dismiss(); } else if (loadingColorDialog.isShowing()){ loadingColorDialog.dismiss(); } else if (loadingColorDialog2.isShowing()){ loadingColorDialog2.dismiss(); } else { finish(); } } } 以上就是对Android 进度条资料整理，后续继续补充相关资料，谢谢大家对本站的支持！ 您可能感兴趣的文章: