Android广播Demo
具体步骤:
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1、初始化广播接收器BroadcastReceiver,接收到的广播会在该类的onReceive方法中回调
2、注册广播registerReceiver(BroadcastReceiver,IntentFilter);
3、发送广播sendBroadcast(Intent);
此demo是为了验证已经被覆盖的Activity在接收到广播时能否自己更新UI,下面是具体代码:
第一步,创建MainActivity,并初始化广播接收器BroadcastReceiver、注册广播
public class MainActivity extends AppCompatActivity { private TextView tipTv; public static final String ACTION_NAME = "TAG_MAIN"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tipTv = (TextView) findViewById(R.id.tipTv); findViewById(R.id.gotoTv).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent(MainActivity.this, SecondActivity.class); startActivityForResult(intent, 100); tipTv.setText("等待接收广播。。。"); } }); //注册广播 registerBoradcastReceiver(); } //广播接收器 private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() { /** * 广播接收器,接收到广播的回调方法 * @param context * @param intent */ @Override public void onReceive(Context context, Intent intent) { Log.d("myp", "=== broadcast callback ==="); String action = intent.getAction(); if (action.equals(ACTION_NAME)) { //当接收到广播时,Toast会在最上层的Activity中提示, Toast.makeText(MainActivity.this, "broadcast callback", Toast.LENGTH_SHORT).show(); String result = intent.getStringExtra("yaner"); tipTv.setText(result); //当接收到广播时,Dialog会在接收到广播的界面提示,并且会随着该界面中的业务逻辑隐藏, // 由此可见,当Activity备覆盖式,如果又出发该Activity业务逻辑的操作,会在该Activity中正常执行 initDialog(); Timer timer = new Timer(); timer.schedule(new TimerTask() { @Override public void run() { if (dialog != null && dialog.isShowing()) dialog.dismiss(); } }, 3 * 1000); } } }; Dialog dialog; /** * 初始化弹出框 */ private void initDialog() { dialog = new Dialog(this); dialog.setContentView(R.layout.view_dialog); dialog.show(); } /** * 注册广播 */ public void registerBoradcastReceiver() { IntentFilter filer = new IntentFilter();//筛选条件 filer.addAction(ACTION_NAME);//设置要注册的广播的标签 //注册广播 registerReceiver(mBroadcastReceiver, filer); Log.d("myp", "=== broadcast regist ==="); } }
第二步,创建SecondActivity,并SecondActivity里实现触发 能发送广播到
MainActivity里的广播的事件
public class SecondActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_second); findViewById(R.id.brodcastBtn).setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent mIntent = new Intent(MainActivity.ACTION_NAME); mIntent.putExtra("yaner", "接收广播成功!!!");//接收到广播时,携带的数据 //发送广播 sendBroadcast(mIntent); Log.d("myp", "=== broadcast send ==="); } }); } }
xml布局文件比较简单,就不给出了,运行效果:
1、点击按钮后,Toast提示在SecondActivity里直接提示
2、点击按钮后,在3秒内返回MainActivity,Dialog正常显示,3秒过后消失
3、点击按钮后,在3秒后返回MainActivity,Dialog已经消失
结论:被覆盖的Activity在接收到广播时能自己能更新UI
分享题目:Android广播Demo
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