Android新手开发之旅-使用广播进行传值

liu

用法：

要传值的类：

[Java] 纯文本查看 复制代码

Intent intent = new Intent();
                intent.setAction("自己定义");
                intent.putExtra("content", "要传的值");
                sendBroadcast(intent);

要接收值的类：

[Java] 纯文本查看 复制代码

 private void getBroadCast() {
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("要和传值时设置的action保持一致");
        registerReceiver(myBroadcastReceive, intentFilter);
    }

    BroadcastReceiver myBroadcastReceive = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String content = intent.getStringExtra("content");
             Log.i("TAG",intent.getStringExtra("content"));
        }
    };

注意：退出时注销广播

[Java] 纯文本查看 复制代码

 @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(myBroadcastReceive);
    }

举个两个Activity之间使用广播传值的例子：activity_main.xml:

[XML] 纯文本查看 复制代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="跳转" />
</LinearLayout>

activity_second.xml:

[XML] 纯文本查看 复制代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical">

    <EditText
        android:id="@+id/et"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:hint="输入内容" />

    <Button
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="传值" />
</LinearLayout>

SecondActivity:

[Java] 纯文本查看 复制代码

public class SecondActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);

        Button mButton = (Button) findViewById(R.id.btn);
        final EditText mEditText = (EditText) findViewById(R.id.et);
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setAction("自己定义");
                intent.putExtra("content", "要传的值");
                sendBroadcast(intent);
                finish();
            }
        });
    }

}

MainActivity:

[Java] 纯文本查看 复制代码

public class MainActivity extends AppCompatActivity {
    private TextView mTextView;
    private Button mButton;

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

        mTextView = (TextView) findViewById(R.id.tv);
        mButton = (Button) findViewById(R.id.btn);
        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, SecondActivity.class);
                startActivity(intent);
            }
        });
        getBroadCast();
    }

    private void getBroadCast() {
        IntentFilter intentFilter = new IntentFilter();
        intentFilter.addAction("要和传值时设置的action保持一致");
        registerReceiver(myBroadcastReceive, intentFilter);
    }

    BroadcastReceiver myBroadcastReceive = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String content = intent.getStringExtra("content");
            mTextView.setText("获取到的值-----" + content);
        }
    };

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(myBroadcastReceive);
    }
}

运行效果：

        

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