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android(多个Activity之间切换)

发布时间:

一、切换Activity的5种方式

Intent intent = new Intent();
(1)intent.setClass(this,OtherActivity.class);
(2)intent.setClassName(this,"com.xiazdong.OtherActivity");
(3)intent.setClassName("com.xiazdong","com.xiazdong.OtherActivity");//此种方式用来激活不同应用的Activity,只需要指定第一个参数:包名 为另一个应用即可;
(4)
Component comp = new Component(this,OtherActivity.class);
intent.setComponent(comp);
(5)Intent intent = new Intent(this,OtherActivity.class);

二、发送参数与接收参数方式
1、putExtra方式:

发送
intent.putExtra("name","xiazdong");
intent.putExtra("age",20);
接收
String name = intent.getStringExtra("name");
int age = intent.getIntExtra("age");

2、Bundle方式:

发送
Bundle bundle = new Bundle();
bundle.putString("name","xiazdong");
bundle.putInt("age",20);
intent.putExtras(bundle);

接收
Bundle bundle = intent.getExtras();
String name = bundle.getString("name");
int age = bundle.getInt("age");

三、示例
3.1、没有返回值的跳转

第一个activity,跳转到下一个activity


package org.xiazdong;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class IntentActivity extends Activity {
private Button btn1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn1 = (Button)this.findViewById(R.id.brn1);
btn1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setClass(IntentActivity.this, SubActivity.class); //从IntentActivity跳转到SubActivity
intent.putExtra("name", "xiazdong"); //放入数据
startActivity(intent); //开始跳转
}
});
}
}


接受上一个activity传过来的参数


package org.xiazdong;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class SubActivity extends Activity{
private TextView tv1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.sub);
tv1 = (TextView)this.findViewById(R.id.tv1);
Intent intent = this.getIntent(); //获得当前的Intent
Bundle bundle = intent.getExtras(); //获得全部数据
String value = bundle.getString("name"); //获得名为name的值
tv1.setText(value);
}

}


3.2、有返回值的跳转示例

package org.xiazdong;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class IntentActivity extends Activity {
private Button btn1;
private TextView tv1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btn1 = (Button)this.findViewById(R.id.brn1);
tv1 = (TextView)this.findViewById(R.id.tv2);
btn1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setClass(IntentActivity.this, SubActivity.class);
startActivityForResult(intent, 100); //requestcode=100

}
});
}
//回调函数,会根据requesrCode进行不同的响应
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode==100&&resultCode==200){
Bundle bundle = data.getExtras();
String response = bundle.getString("response");
tv1.setText(response);
}
}

}


package org.xiazdong;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class SubActivity extends Activity{
private TextView tv1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.sub);
tv1 = (TextView)this.findViewById(R.id.tv1);
Intent intent = new Intent(); //创建一个Intent
intent.putExtra("response", "来自2");
setResult(200,intent); //返回码为200
finish();
}

}



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