(Android review)開啟Activity返回結果

(Android review)開啟Activity返回結果

一、基本知識點

其實要完成這個功能很簡單：

1、MainActivity

startActivityForResult(intent, 100);//第二個是請求碼

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

if(data != null){
if(resultCode == 200){//可以根據請求嗎來判斷,也可以根據結果碼來判斷

String username = data.getStringExtra("username");
et_username.setText(username);
}
}
}

2、MainActivity2

setResult(200,intent);//第一個參數是返回碼

二、代碼

1、MainActivity

package com.example.setresult;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.Menu;import android.view.View;import android.widget.EditText;public class MainActivity extends Activity {public EditText et_username;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);et_username = (EditText) findViewById(R.id.et_name);}public void get(View view){Intent intent = new Intent(this, MainActivity2.class);startActivityForResult(intent, 100);//第二個是請求碼}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if(data != null){if(resultCode == 200){//可以根據請求嗎來判斷,也可以根據結果碼來判斷String username = data.getStringExtra("username");et_username.setText(username);}}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

2、MainActivity2

package com.example.setresult;import android.app.Activity;import android.content.Intent;import android.graphics.Color;import android.os.Bundle;import android.view.TextureView;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.ListView;import android.widget.TextView;public class MainActivity2 extends Activity {public ListView listView;public MyAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main2);listView = (ListView) findViewById(R.id.listview);adapter = new MyAdapter();listView.setAdapter(adapter);listView.setOnItemClickListener(new MyOnItemClickListener());}public class MyOnItemClickListener implements OnItemClickListener{@Overridepublic void onItemClick(AdapterView arg0, View arg1, int position,long arg3) {Intent intent = new Intent(getApplicationContext(), MainActivity.class);String username = (String) adapter.getItem(position);intent.putExtra("username", username);setResult(200,intent);//第一個參數是返回碼finish();//講當前的activity結束掉}}public class MyAdapter extends BaseAdapter{String names[] =  new String[]{"hjd","hjd1","hjd2","hjd3","hjd4"};@Overridepublic int getCount() {return names.length;}@Overridepublic Object getItem(int position) {return names[position];}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View arg1, ViewGroup arg2) {TextView tv = new TextView(getApplicationContext());tv.setText(names[position]);tv.setTextSize(25);tv.setTextColor(Color.GREEN);return tv;}}}

三、源碼下載

http://download.csdn.net/detail/caihongshijie6/7793215

四、