android-活动之间的数据传输

曾经终败给现在 2022-07-19 05:59 147阅读 0赞

## android 活动之间数据传输 ##

1.  向下个活动传数据
    
     *  活动FirstActivity代码：

button1.setOnClickListener(new OnClickListener() { 
     @Override 
    	 public void onClick(View v) { 
    		 String data = "Hello SecondActivity"; 
    		 Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
    		 intent.putExtra("extra_data", data); 
    		 startActivity(intent); 
    	 } 
    });

*  活动SecondActivity代码：

public class SecondActivity extends Activity { 
    @Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState); 
    		setContentView(R.layout.second_layout); 
    		Intent intent = getIntent(); 
    		String data = intent.getStringExtra("extra_data"); 
    		Log.d("SecondActivity", data); 
    		} 
    }

1.  向上一个活动返回数据：

*  FirstActivity代码：

button1.setOnClickListener(new OnClickListener() {  
    	@Override 
    	public void onClick(View v) {  
    		Intent intent = new Intent(FirstActivity.this, SecondActivity.class); 
    		startActivityForResult(intent, 1);
    	} 
    });
    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
    	switch (requestCode) {  
    	case 1: 
    		if (resultCode == RESULT_OK) {  
    		String returnedData = data.getStringExtra("data_return"); 
    		Log.d("FirstActivity", returnedData); } 
    		break; 
    	default: 
    		break;
    	} 
    }

*  SecondActivity代码

public class SecondActivity extends Activity {  
    	@Override 
    	protected void onCreate(Bundle savedInstanceState) {  
    		super.onCreate(savedInstanceState); 
    		requestWindowFeature(Window.FEATURE_NO_TITLE); 
    		setContentView(R.layout.second_layout); 
    		Button button2 = (Button) findViewById(R.id.button_2); 
    		button2.setOnClickListener(new OnClickListener() { 
    			@Override 
    			public void onClick(View v) {  
    				Intent intent = new Intent(); 
    				intent.putExtra("data_return", "Hello FirstActivity"); 
    				setResult(RESULT_OK, intent); finish(); }
    			});
    	}
    }