Android笔记 - 如何避免ActivityNotFound异常，查看Activity堆栈信息,获取进程名

1.android中查看是否有能够打开intent的Activity

android中查看是否有能够打开intent的Activity方式有三种（如果没有打开intent的Activity，会报错ActivityNotFound）

1. intent的resolveActivity
2. packagemanager的resolveActivity
3. packagemanager的queryIntentActivities

区别：
resolveActivity返回最佳匹配的一个Activity
queryIntentActivities返回匹配的所有Activity List

具体使用代码如下

b=(Button) findViewById(R.id.to2);
b.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            Intent intent = new Intent();
            intent.setAction("com.chj.a");
//              intent.setDataAndType(Uri.parse("content://xxx"), "text/plain");
            if(null != intent.resolveActivity(getPackageManager())){
                Log.e("chj", "target activities are: "+intent.resolveActivity(getPackageManager()));
                startActivity(intent);
            }else{
                Toast.makeText(MainActivity.this, "Target Activity Not Found", Toast.LENGTH_SHORT).show();
            }


            if(null != getPackageManager().resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY)){
                Log.e("chj", "target activities are: "+getPackageManager().resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY));
            }else{
                Toast.makeText(MainActivity.this, "Target Activity Not Found", Toast.LENGTH_SHORT).show();
            }

            if(getPackageManager().queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY).size()>0){
                Log.e("chj", "target activities are: "+getPackageManager().queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY));
            }else{
                Toast.makeText(MainActivity.this, "Target Activity Not Found", Toast.LENGTH_SHORT).show();
            }

        }
    });

2.查看Activity堆栈信息：

adb shell dumpsys activity activities
log中Running activities附近的log

3.获取进程名称

public class MyApplication extends Application{
    @Override
    public void onCreate() {
        super.onCreate();
        Log.v("chj", "MyApplication onCreate "+getProcessName());
    }

    public String getProcessName(){
        int pid = android.os.Process.myPid();
        String processName = "";
        ActivityManager manager = (ActivityManager) getApplicationContext().getSystemService(Context.ACTIVITY_SERVICE);
        for (ActivityManager.RunningAppProcessInfo process: manager.getRunningAppProcesses()) {
            if(process.pid == pid)
            {
                processName = process.processName;
            }
        }

       return processName;
    }

}

注意Application需要在清单文件注册android:name，否则onCreate不会执行