meta-data标签的使用

package cn.com.hg.act; import android.app.Activity; import android.content.Intent; import android.content.pm.ActivityInfo; import android.content.pm.ApplicationInfo; import android.content.pm.PackageManager; import android.content.pm.PackageManager.NameNotFoundException; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Toast; public class MyActivity extends Activity implements OnClickListener { private Button btn_act, btn_app, btn_ser, btn_rec; private String msg = null; private ActivityInfo actInfo = null; private ApplicationInfo appInfo = null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); try { actInfo = this.getPackageManager().getActivityInfo( getComponentName(), PackageManager.GET_META_DATA); appInfo = this.getPackageManager().getApplicationInfo( getPackageName(), PackageManager.GET_META_DATA); } catch (NameNotFoundException e) { e.printStackTrace(); } setContentView(R.layout.metadata); btn_act = (Button) findViewById(R.id.btn1); btn_app = (Button) findViewById(R.id.btn2); btn_ser = (Button) findViewById(R.id.btn3); btn_rec = (Button) findViewById(R.id.btn4); btn_act.setOnClickListener(this); btn_app.setOnClickListener(this); btn_ser.setOnClickListener(this); btn_rec.setOnClickListener(this); } public void onClick(View view) { switch (view.getId()) { // activity case R.id.btn1: msg = actInfo.metaData.getString("activity_name");// bundle.getextra Toast.makeText(this, msg, Toast.LENGTH_SHORT).show(); break; // application case R.id.btn2: msg = appInfo.metaData.getString("application_name"); Toast.makeText(this, msg, Toast.LENGTH_SHORT).show(); break; // service case R.id.btn3: Intent intent = new Intent(this, MyService.class); startService(intent); break; // receive case R.id.btn4: msg = appInfo.metaData.getString("myMsg"); break; } } }