[Android] Launcher Icon bage Number

今天試著把launcher icon 加了數字提示，找到一篇可以用的，

在我的LG手機上測試正常


程式碼

import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.util.List;


public class MainActivity extends ActionBarActivity {

    int count=0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button sent=(Button)findViewById(R.id.set);
        Button reset=(Button)findViewById(R.id.reset);
        final TextView text=(TextView)findViewById(R.id.textView);

        sent.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                text.setText(String.valueOf(++count));
                setBadge(MainActivity.this,count);
            }
        });

        reset.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                text.setText("0");
                count=0;
                setBadge(MainActivity.this,count);
            }
        });

    }

    public static void setBadge(Context context, int count) {
        String launcherClassName = getLauncherClassName(context);
        if (launcherClassName == null) {
            return;
        }
        Intent intent = new Intent("android.intent.action.BADGE_COUNT_UPDATE");
        intent.putExtra("badge_count", count);
        intent.putExtra("badge_count_package_name", context.getPackageName());
        intent.putExtra("badge_count_class_name", launcherClassName);
        context.sendBroadcast(intent);
    }

    public static String getLauncherClassName(Context context) {

        PackageManager pm = context.getPackageManager();

        Intent intent = new Intent(Intent.ACTION_MAIN);
        intent.addCategory(Intent.CATEGORY_LAUNCHER);

        List<ResolveInfo> resolveInfos = pm.queryIntentActivities(intent, 0);
        for (ResolveInfo resolveInfo : resolveInfos) {
            String pkgName = resolveInfo.activityInfo.applicationInfo.packageName;
            if (pkgName.equalsIgnoreCase(context.getPackageName())) {
                String className = resolveInfo.activityInfo.name;
                return className;
            }
        }
        return null;
    }
}

Layout

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    >

    <TextView
        android:text="@string/hello_world"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textView" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Set Bage"
        android:id="@+id/set"
        android:layout_below="@+id/textView"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Reset Bage"
        android:id="@+id/reset"
        android:layout_below="@+id/set"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />

</RelativeLayout>

執行結果

參考連結中的第二篇有提到一點要注意。

注意launcherClassName 必須被設定成   

android.intent.category.LAUNCHER

參考資料：

http://stackoverflow.com/questions/17565307/how-to-display-count-of-notifications-in-app-launcher-icon

http://my.oschina.net/ososchina/blog/352286