android 利用startActivityForResult()方法得到另一个Activity的返回值

最新推荐文章于 2024-05-28 22:16:07 发布

最新推荐文章于 2024-05-28 22:16:07 发布 · 149 阅读

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本文介绍了一个简单的Android应用程序，由两个Activity组成。第一个Activity允许用户输入信息并传递到第二个Activity进行编辑，然后将编辑后的信息返回给第一个Activity显示。通过这个过程，展示了Android中Activity之间的数据传递和交互方式。

第一个Activity

package yyy.testandroid5;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class TestAndroid5Activity extends Activity {
	private EditText edit;
	private Button button;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        edit = (EditText) findViewById(R.id.edit);
        button = (Button) findViewById(R.id.button);
        
        button.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View arg0) {
		        // TODO Auto-generated method stub
		        //打开第二个Activity
		        Intent intent = new Intent();  
		        intent.setComponent(new ComponentName("yyy.testandroid6", "yyy.testandroid6.TestAndroid6Activity"));  
		        intent.setAction(Intent.ACTION_VIEW);  
		        intent.putExtra("test", edit.getText().toString());
		        startActivityForResult(intent, 0);  
			}
		});
        
    }
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		// TODO Auto-generated method stub
		super.onActivityResult(requestCode, resultCode, data);
		if(requestCode == 0){
			edit.setText(data.getStringExtra("return"));
		}
	}
    
}

第二个Activity

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class TestAndroid6Activity extends Activity {
	
	private TextView text;
	private EditText edit;
	private Button button;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        edit = (EditText) findViewById(R.id.edit);
        button = (Button) findViewById(R.id.button);
        String str = getIntent().getStringExtra("test");
        edit.setText(str);
        
        button.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				//添加给第一个Activity的返回值，并设置resultCode
				Intent intent = new Intent();
				intent.putExtra("return", edit.getText().toString());
				setResult(RESULT_OK, intent);
				finish();
			}
		});
    }
}