如何在Activity中启动另一个Activity与值传递

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1. 如何在Activity中启动另一个Activity？

（1）在Android Mainifest 文件中声明Activity

格式如下：

（2）调用startActivity（Intent intent）方法

Intent intent=newIntent(MainActivity.this,NextActivity.class);

startActivity（Intent intent）；

2把数据从一个Activity传到另一个Activity

(1) 直接采用Intent封装

a．发送部分

Intentintent=newIntent(MainActivity.this,NextActivity.class);

Stringa=edittext1.getText().toString().trim();

Stringb=edittext2.getText().toString().trim();

intent.putExtra("message",a+"+"+b+"=");

startActivity(intent);

b．接收部分

Intent intent = getIntent();

String message = intent.getStringExtra("message");

shizi.setText(message);

完整代码如下：

MainActivity：

packagecom.example.firstactivity;

importandroid.os.Bundle;

importandroid.app.Activity;

importandroid.content.Intent;

importandroid.view.View;

importandroid.widget.Button;

importandroid.widget.EditText;

publicclass MainActivity extends Activity {

private Button button1;

private EditText edittext1,edittext2,edittext3;

@Override

protected void onCreate(BundlesavedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

edittext1=(EditText)findViewById(R.id.editText1);

edittext2=(EditText)findViewById(R.id.editText2);

edittext3=(EditText)findViewById(R.id.edittext3);

button1=(Button)findViewById(R.id.button1);

button1.setOnClickListener(new View.OnClickListener()

{

@Override

public void onClick(View v){

// TODOAuto-generated method stub

Intent intent=newIntent(MainActivity.this,NextActivity.class);

Stringa=edittext1.getText().toString().trim();

Stringb=edittext2.getText().toString().trim();

intent.putExtra("message",a+"+"+b+"=");

startActivityForResult(intent,1000);

}

});

}

@Override

protected void onActivityResult(intrequestCode, int resultCode, Intent data) {

// TODO Auto-generated method stub

super.onActivityResult(requestCode,resultCode, data);

if (requestCode == 1000 &&resultCode == 1001) {

//从子窗口中获取返回结果

String result_value =data.getStringExtra("result");

edittext3.setText(result_value);

}

NextActivity：

packagecom.example.firstactivity;

importandroid.app.Activity;

importandroid.content.Intent;

importandroid.os.Bundle;

importandroid.view.View;

importandroid.widget.Button;

importandroid.widget.EditText;

importandroid.widget.TextView;

publicclass NextActivity extends Activity {

private TextView shizi;

private Button button2;

private EditText result ;

public NextActivity() {

// TODO Auto-generated constructorstub

}

@Override

protected void onCreate(BundlesavedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.next);

button2 =(Button)this.findViewById(R.id.button2);

result =(EditText)this.findViewById(R.id.result);

shizi =(TextView)this.findViewById(R.id.shizi);

Intent intent = getIntent();

String message =intent.getStringExtra("message");

shizi.setText(message);

button2.setOnClickListener(newView.OnClickListener() {

@Override

public void onClick(View v){

// TODOAuto-generated method stub

String value =result.getText().toString().trim();

Intent intent =new Intent();

intent.putExtra("result",value);

//设置回传的意图

setResult(1001,intent);

finish();//结束activity的生命周期

}

});

}

（2）采用Bundle封装

a.发送部分

Bundle bundle=new Bundle();

Bundle.putString(“name”,name);

Intent.putExtras(bundle);

startActivity(intent);

b．接收部分

Bundle bundle=this.getIntent().getExtras();

String name=bundle.getString(“name”);

(EditText)et.setText(name);

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