android温故知新-----android 本地广播实例（LocalBroadcastManager）

来源：互联网发布：淘宝客api申请编辑：程序博客网时间：2024/05/17 02:42

特点：

1.能够防止其他app接收到广播消息获取敏感数据，确保数据安全。

2.只能在代码中使用动态注册的方式，

java代码

public class MainActivity extends AppCompatActivity {    private LocalBroadcastManager mLocalBroadcastManager;    private BroadcastReceiver mBroadcastReceiver;    private TextView txtv;    private Button btn;    private final String STR = "Str";    private final String TESTACTION = "com.intent.localbroadcast.test.action";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        btn = (Button) findViewById(R.id.btn);        txtv = (TextView) findViewById(R.id.txtv);        mLocalBroadcastManager = LocalBroadcastManager.getInstance(this);        mBroadcastReceiver = new BroadcastReceiver() {            @Override            public void onReceive(Context context, Intent intent) {                String str = intent.getStringExtra(STR);                txtv.setText(str);            }        };        IntentFilter intentFilter = new IntentFilter(TESTACTION);        mLocalBroadcastManager.registerReceiver(mBroadcastReceiver, intentFilter);        btn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Intent intent = new Intent(TESTACTION);                intent.putExtra(STR, "我是一个本地广播");                mLocalBroadcastManager.sendBroadcast(intent);            }        });    }    @Override    protected void onDestroy() {        super.onDestroy();        mLocalBroadcastManager.unregisterReceiver(mBroadcastReceiver);    }}

xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/activity_main"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:orientation="vertical"    tools:context="com.localbroadcasttest.MainActivity">    <TextView        android:id="@+id/txtv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Hello World!"/>    <Button        android:id="@+id/btn"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="send"        /></LinearLayout>

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