Android实现自定义加载框的代码示例

App在与服务器进行网络交互的时候，需要有一个提示的加载框，如图：

此时我们可以自定义一个加载中的对话框，代码如下：

public class LoadingDialog extends Dialog {
private static final int CHANGE_TITLE_WHAT = 1;
private static final int CHNAGE_TITLE_DELAYMILLIS = 300;
private static final int MAX_SUFFIX_NUMBER = 3;
private static final char SUFFIX = '.'; 

private ImageView iv_route;
private TextView detail_tv;
private TextView tv_point;
private RotateAnimation mAnim; 

private Handler handler = new Handler() {
private int num = 0; 

public void handleMessage(android.os.Message msg) {
if (msg.what == CHANGE_TITLE_WHAT) {
StringBuilder builder = new StringBuilder();
if (num >= MAX_SUFFIX_NUMBER) {
num = 0;
}
num++;
for (int i = 0; i < num; i++) {
builder.append(SUFFIX);
}
tv_point.setText(builder.toString());
if (isShowing()) {
handler.sendEmptyMessageDelayed(CHANGE_TITLE_WHAT, CHNAGE_TITLE_DELAYMILLIS);
}
else {
num = 0;
}
}
};
}; 

public LoadingDialog(Context context) {
super(context, R.style.Dialog_bocop);
init();
} 

public LoadingDialog(Context context, boolean isTrans) {
super(context, isTrans ? R.style.Loading_Dialog_trans : R.style.Dialog_bocop);
init();
} 

private void init() {
setContentView(R.layout.common_dialog_loading_layout);
iv_route = (ImageView) findViewById(R.id.iv_route);
detail_tv = (TextView) findViewById(R.id.detail_tv);
tv_point = (TextView) findViewById(R.id.tv_point);
initAnim();
getWindow().setWindowAnimations(R.anim.alpha_in);
} 

private void initAnim() {
// mAnim = new RotateAnimation(360, 0, Animation.RESTART, 0.5f, Animation.RESTART, 0.5f);
mAnim = new RotateAnimation(0, 360, Animation.RESTART, 0.5f, Animation.RESTART, 0.5f);
mAnim.setDuration(2000);
mAnim.setRepeatCount(Animation.INFINITE);
mAnim.setRepeatMode(Animation.RESTART);
mAnim.setStartTime(Animation.START_ON_FIRST_FRAME);
} 

@Override
public void show() {//在要用到的地方调用这个方法
iv_route.startAnimation(mAnim);
handler.sendEmptyMessage(CHANGE_TITLE_WHAT);
super.show();
} 

@Override
public void dismiss() {
mAnim.cancel();
super.dismiss();
} 

@Override
public void setTitle(CharSequence title) {
if (TextUtils.isEmpty(title)) {
detail_tv.setText("正在加载");
}
else {
detail_tv.setText(title);
}
} 

@Override
public void setTitle(int titleId) {
setTitle(getContext().getString(titleId));
} 

public static void dismissDialog(LoadingDialog loadingDialog) {
if (null == loadingDialog) { return; }
loadingDialog.dismiss();
}
}

-------------对应的布局如下------------------

<?xml version="1.0" encoding="utf-8"?>
  <LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="160dp"
    android:layout_height="160dp"
    android:layout_gravity="center"
    android:background="@drawable/common_show_dialog"
    android:orientation="vertical" > 

    <RelativeLayout
      android:layout_width="fill_parent"
      android:layout_height="0dp"
      android:layout_weight="3"
      android:paddingTop="22dp"
      android:gravity="center" > 

      <ImageView
        android:id="@+id/iv_route"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:background="@drawable/dialog_bocop_loading_rotate_anim_img" />
    </RelativeLayout> 

    <RelativeLayout
      android:layout_width="fill_parent"
      android:layout_height="0dp"
      android:layout_marginBottom="15dp"
      android:layout_marginLeft="10dp"
      android:layout_marginRight="10dp"
      android:layout_weight="1"
      android:gravity="center_horizontal" > 

      <TextView
        android:id="@+id/detail_tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_toLeftOf="@+id/tv_point"
        android:ellipsize="marquee"
        android:gravity="center"
        android:singleLine="true"
        android:text="正在加载..."
        android:textColor="#ffffff"
        android:textSize="20sp" /> 

      <TextView
        android:id="@+id/tv_point"
        android:layout_width="20dp"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:text="..."
        android:textColor="#ffffff"
        android:textSize="20sp" />
    </RelativeLayout>
  </LinearLayout>

比如在Activity中要实现加载对话框调用 ：

LoadingDialog loadingDialog ; 

if (null == loadingDialog) {
loadingDialog = new LoadingDialog(aty);
loadingDialog.setOnCancelListener(this);
}
loadingDialog.setTitle(“数据加载中”);
if (!loadingDialog.isShowing()) loadingDialog.show(); 

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