关于监听器的实现方法和Toast

一、关于监听器的实现：（Andorid中）MainActivity1中1、用内部类实现（1）private Button bt =null;protected void onCreate(Bundle savedInstanceState) {（2）super.onCreate(savedInstanceState);setContentView(yout.activity_main_activity1);bt =(Button) this.findViewById(R.id.bt1);bt.setOnClickListener(new ClickListener());}（3）private class ClickListener implements OnClickListener{@Overridepublic void onClick(View v) {// TODO Auto-generated method stubIntent intent = new Intent();intent.setClass(MainActivity1.this, SecondActivity.class);MainActivity1.this.startActivity(intent);}2、用匿名内部类实现。

private Button bt =null;// bt.setOnClickListener(new ClickListener());bt.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View v){// TODO Auto-generated method stubIntent intent = new Intent();intent.setClass(MainActivity1.this, SecondActivity.class);MainActivity1.this.startActivity(intent);}});@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main_activity1, menu);return true;}// private class ClickListener implements OnClickListener// {//// @Override// public void onClick(View v) {// // TODO Auto-generated method stub// Intent intent = new Intent();// intent.setClass(MainActivity1.this, SecondActivity.class);// MainActivity1.this.startActivity(intent);//// }//// }3、给相应组键添加一个属性。

protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(yout.activity_main_activity1);bt =(Button) this.findViewById(R.id.bt1);//bt.setOnClickListener(new ClickListener());// bt.setOnClickListener(new OnClickListener()// {//// @Override// public void onClick(View v)// {// // TODO Auto-generated method stub// Intent intent = new Intent();// intent.setClass(MainActivity1.this, SecondActivity.class); // MainActivity1.this.startActivity(intent);// }// });}4、（res->layout->主布局文件中，如：activity_main_activity1.xml中）<RelativeLayout xmlns:android="/apk/res/android"xmlns:tools="/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context=".MainActivity1" ><TextViewandroid:id="@+id/msg_1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="@string/msg_str" /><Buttonandroid:id="@+id/bt1"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignLeft="@+id/msg_1"android:layout_below="@+id/msg_1"android:layout_marginLeft="70dp"android:layout_marginTop="111dp"android:onClick="jumpToActivity2"android:text="@string/hello_world" /></RelativeLayout>（2）public void jumpToActivity2(View v){Intent intent = new Intent();intent.setClass(MainActivity1.this, SecondActivity.class);MainActivity1.this.startActivity(intent);}二、关于Toast的应用。

1.在MainActivity1中，追加字符串。

private class ClickListener implements OnClickListener{@Overridepublic void onClick(View v) {// TODO Auto-generated method stubIntent _intent = new Intent();_intent.setClass(MainActivity1.this, SecondActivity.class);_intent.putExtra("ycintent", "很高兴认识你!");_intent.putExtra("ycintent", "Glad to meet you!");MainActivity1.this.startActivity(_intent);MainActivity1.this.startActivityForResult(_intent, 123);}}2、SecondActivity中public class SecondActivity extends Activity {private EditText et_1;private Intent getIntent;private Button bt_2=null;@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);this.setContentView(yout.second_layout);bt_2=(Button) this.findViewById(R.id.bt2);bt_2.setOnClickListener(new MyClickListener());Button buttonClose=(Button)this.findViewById(R.id.button2Close); buttonClose.setOnClickListener(new OnClickListener(){@Overridepublic void onClick(View v){// TODO Auto-generated method stubString setValue = et_1.getText().toString();getIntent.putExtra("ycintentreturn",setValue);setResult(123, getIntent);finish();}});getIntent = this.getIntent();String getValue = getIntent.getStringExtra("ycintent");et_1=(EditText) findViewById(R.id.et12);et_1.setText(getValue);}private class MyClickListener implements OnClickListener{@Overridepublic void onClick(View v) {// TODO Auto-generated method stubIntent intent = new Intent();intent.setClass(SecondActivity.this, ThirdActivity.class);SecondActivity.this.startActivity(intent);}}3、second_layout.xml中<?xml version="1.0"encoding="utf-8"?><LinearLayout xmlns:android="/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><EditTextandroid:id="@+id/et12"android:layout_width="fill_parent"android:layout_height="55dip"android:hint="@string/name"android:layout_marginLeft="5dip"android:layout_marginRight="5dip"android:singleLine="true"/><Buttonandroid:id="@+id/bt2"android:layout_width="fill_parent"android:layout_height="wrap_content"android:text="@string/msg_2"/><Buttonandroid:id="@+id/button2Close"android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_marginTop="50dip"android:text="关闭按钮"/></LinearLayout>5、MainActivity1中，调用@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data){// TODO Auto-generated method stubsuper.onActivityResult(requestCode, resultCode, data);if(requestCode == 123){S tring returnValue= data.getStringExtra("ycintentreturn");T oast.makeText(this, "返回值:"+returnValue, 5000).show();}}。