在两个activity间传值.doc

一、 android开发之在activity中控制另一个activity的UI更新 1.在MyAPP中定义属性handlerjava view plaincopyprint?1 package ; 2 3 import .MasterActivity.MyHandler; 4 import android.app.Application; 5 6 /* 7 * 自己实现Application，实现数据共享 8 * author jason 9 */ 10 public class MyAPP extends Application 11 / 共享变量 12 private MyHandler handler = null; 13 14 / set方法 15 public void setHandler(MyHandler handler) 16 this.handler = handler; 17 18 19 / get方法 20 public MyHandler getHandler() 21 return handler; 22 23 24 2、在主activity 中给MyAPP的属性handler赋值java view plaincopyprint?25 Override 26 public void onCreate(Bundle savedInstanceState) 27 28 super.onCreate(savedInstanceState); 29 setContentView(R.layout.main); 30 31 32 mAPP = (MyAPP) getApplication(); 33 handler = new MyHandler(); 34 tv = (TextView) findViewById(R.id.tv); 35 btn_to = (Button) findViewById(R.id.btn_to); 36 37 / 设置监听器 38 btn_to.setOnClickListener(new OnClickListener() 39 Override 40 public void onClick(View v) 41 / 设置共享变量 42 mAPP.setHandler(handler); 43 / 启动另一个Activity 44 Intent intent = new Intent(MasterActivity.this, 45 ToChangeViewActivity.class); 46 startActivity(intent); 47 48 ); 49 50 3、在另一个activity中获取MyAPP中handler进行传值java view plaincopyprint?51 protected void onCreate(Bundle savedInstanceState) 52 super.onCreate(savedInstanceState); 53 setContentView(R.layout.show); 54 55 mAPP = (MyAPP) getApplication(); 56 / 获得该共享变量实例 57 mHandler = mAPP.getHandler(); 58 findViewById(R.id.btn_chang).setOnClickListener(new OnClickListener() 59 60 Override 61 public void onClick(View v) 62 / 发送消息 63 mHandler.sendEmptyMessage(CHANGED); 64 ToChangeViewActivity.this.finish(); 65 66 ); 67 68 二、android开发之如何在两个activity之间传递handler_利用broadcast广播机制其实很简单，就是Broadcast的应用，替换了原来想要通过共享handler解决的思路。代码如下：MainActivity：java view plaincopyprint?69 package jason.broadcastinsteadofhanlderdemo; 70 71 import android.app.Activity; 72 import android.content.BroadcastReceiver; 73 import android.content.Context; 74 import android.content.Intent; 75 import android.content.IntentFilter; 76 import android.os.Bundle; 77 import android.view.View; 78 import android.view.View.OnClickListener; 79 import android.widget.Button; 80 import android.widget.TextView; 81 82 public class MainActivity extends Activity 83 84 TextView textView; 85 Button sButton; 86 87 Override 88 protected void onCreate(Bundle savedInstanceState) 89 super.onCreate(savedInstanceState); 90 setContentView(R.layout.activity_main); 91 textView = (TextView) findViewById(R.id.show); 92 sButton = (Button) findViewById(R.id.startAnother); 93 sButton.setOnClickListener(new OnClickListener() 94 95 Override 96 public void onClick(View v) 97 / TODO Auto-generated method stub 98 startActivity(new Intent(MainActivity.this,AnotherActivity.class); 99 100 ); 101 IntentFilter filter = new IntentFilter(AnotherActivity.action); 102 registerReceiver(broadcastReceiver, filter); 103 104 105 BroadcastReceiver broadcastReceiver = new BroadcastReceiver() 106 107 Override 108 public void onReceive(Context context, Intent intent) 109 / TODO Auto-generated method stub 110 textView.setText(intent.getExtras().getString(data); 111 112 ; 113 114 protected void onDestroy() 115 unregisterReceiver(broadcastReceiver); 116 ; 117 AnotherActivity：java view plaincopyprint?118 package jason.broadcastinsteadofhanlderdemo; 119 120 import android.app.Activity; 121 import android.content.Intent; 122 import android.os.Bundle; 123 import android.view.View; 124 import android.view.View.OnClickListener; 125 import android.widget.Button; 126 127 public class AnotherActivity extends Activity 128 129 public static final String action = jason.broadcast.action; 130 131 Button update; 132 133 Override 134 protected void onCreate(Bundle savedInstanceState) 135 / TODO Auto-generated method stub 136 super.onCreate(savedInstanceState); 137 setContentView(R.layout.another); 138 update = (Button) findViewById(R.id.updateMain); 139 update.setOnClickListener(new OnClickListener() 140 141 Override 142