Android-Activity数据的回传

Activity数据的回传

1.startActivityForResult(intent)

2.onActivityResult

package com.maizi.edu.bundle;

import …

public class MainActivity extends AppCompatActivity{

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

     Button bth = (Button) findViewById(R.id.bth_start);
     bth.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v){
            Intent intent = new Intent(MainActivity.this, SecondActivity.class);

            startActivityForResult(intent, 100);
        }
    });
}

@Override
protected void onActivityResult(int requestCode, Intent data){
    super.onActivityResult(requestCode, requestCode, data);

    String backData = data.getStringExtra("back_data");
    Log.e("MainActivity", "onActivityResult, requestCode="+requestCode+", backData="+backData);
}

}

package com.maizi.edu.bundle;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class SecondActivity extends Activity{

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

    TextView paramsTextView = (TextView) findViewById(R.id.tv_params);

    Intent intent = new Intent();
    intent.putExtra("back_data", "这是一段回传的数据")；
    setResult(RESULT_OK,_intent);
}

}

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="传递的数据是"/>

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

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

   <activity
       android:name=".MainActivity">
       <intent-filter>
           <action android:name="android.intent.action.MAIN" />
           <category android:name="android.intent.category.LAUNCHER" />
       </intent-filter>
   </activity>

    <activity android:name=".SecondActivity" />

<TextView
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"
    android:text="第一个Activity"/>

<Button
    android:id="@+id/bth_start"
    android:text="启动并传递参数"
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"