0.设想
- 实现Intent实现页面跳转的几种方法;
- 并且测试一下Intent拨号和开启浏览器的方法。
1.啥是Intent呀?
- Intent被翻译成意图、信使;
- 负责在组件之间传递动作和数据;
2.Intent实现页面跳转与传值
参考https://blog.youkuaiyun.com/u013969018/article/details/79834175
2.1主界面MainActivity跳转到界面A(ActivityA)
MainActivity.java
package com.yh.intenttest;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private Button switch_bt1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
//组件初始化
private void initView(){
switch_bt1 = findViewById(R.id.switch_bt1);
switch_bt1.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.switch_bt1:
Intent intent1 = new Intent(MainActivity.this,ActivityA.class);
startActivity(intent1);
break;
default:
break;
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="当前为主界面MainActivity"
android:layout_above="@+id/switch_bt1"
android:layout_marginBottom="40dp"
android:textSize="30sp"
/>
<Button
android:id="@+id/switch_bt1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="跳转到界面A"
android:textSize="30sp"
/>
</LinearLayout>
</RelativeLayout>
ActivityA.java
package com.yh.intenttest;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class ActivityA extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_a);
}
}
activity_a.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
tools:context=".ActivityA">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="这是ActivityA——界面A"
android:textSize="30sp"
/>
</RelativeLayout>
运行结果:
2.2主界面MainActivity跳转到界面B(ActivityB),并向界面B传值
- 方法1:附加数据到Intent对象上
MainActivity.java
package com.yh.intenttest;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private Button switch_bt1;
private Button switch_bt2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
//组件初始化
private void initView(){
switch_bt1 = findViewById(R.id.switch_bt1);
switch_bt1.setOnClickListener(this);
switch_bt2 = findViewById(R.id.switch_bt2);
switch_bt2.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.switch_bt1:
Intent intent1 = new Intent(MainActivity.this,ActivityA.class);
startActivity(intent1);
break;
case R.id.switch_bt2:
Intent intent2 = new Intent(MainActivity.this,ActivityB.class);
intent2.putExtra("ActivityName","我是MainActivity!");
intent2.putExtra("Data",18);
startActivity(intent2);
break;
default:
break;
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="当前为主界面MainActivity"
android:layout_above="@+id/switch_bt1"
android:layout_marginBottom="40dp"
android:textSize="30sp"
/>
<Button
android:id="@+id/switch_bt1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="跳转到界面A"
android:textSize="30sp"
android:layout_marginBottom="30dp"
/>
<Button
android:id="@+id/switch_bt2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="跳转并传数据到界面B"
android:textSize="30sp"
/>
</LinearLayout>
</RelativeLayout>
ActivityB.java
package com.yh.intenttest;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
public class ActivityB extends AppCompatActivity {
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_b);
initView();
}
private void initView(){
textView = findViewById(R.id.switch_tv_b);
Intent intent = getIntent();
String activityName = intent.getStringExtra("ActivityName");
int data = intent.getIntExtra("Data",0);
textView.setText(activityName+"\n\r传来了数据:"+data);
}
}
activity_b.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
tools:context=".ActivityB">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="这是ActivityB——界面B"
android:textSize="30sp"
android:layout_marginBottom="30dp"
/>
<TextView
android:id="@+id/switch_tv_b"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="这里存储接收的数据信息"
android:textSize="30sp"
/>
</LinearLayout>
</RelativeLayout>
运行结果:
- 方法2:使用Bundle捆绑数据到Intent上
只需要修改Intent那部分:
MainActivity.java
Intent intent2 = new Intent(MainActivity.this,ActivityB.class);
/*
intent2.putExtra("ActivityName","我是MainActivity!");
intent2.putExtra("Data",18);
*/
Bundle bundle = new Bundle();
bundle.putString("ActivityName","我是MainActivity(Bundle)!");
bundle.putInt("Data",18);
intent2.putExtras(bundle);
startActivity(intent2);
break;
ActivityB.java
Intent intent = getIntent();
/*String activityName = intent.getStringExtra("ActivityName");
int data = intent.getIntExtra("Data",0);
*/
Bundle bundle = intent.getExtras();
String activityName = bundle.getString("ActivityName");
int data = bundle.getInt("Data");
textView.setText(activityName+"\n\r传来了数据:"+data);
运行结果没有问题:
2.3主界面MainActivity跳转到界面C(ActivityC),向界面C传值并获得C传来的值
MainActivity.java
package com.yh.intenttest;
import android.content.Intent;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private Button switch_bt1;
private Button switch_bt2;
private Button switch_bt3;
private TextView switch_tv_main;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
//组件初始化
private void initView(){
switch_bt1 = findViewById(R.id.switch_bt1);
switch_bt1.setOnClickListener(this);
switch_bt2 = findViewById(R.id.switch_bt2);
switch_bt2.setOnClickListener(this);
switch_bt3 = findViewById(R.id.switch_bt3);
switch_bt3.setOnClickListener(this);
switch_tv_main = findViewById(R.id.switch_tv_main);
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.switch_bt1:
Intent intent1 = new Intent(MainActivity.this,ActivityA.class);
startActivity(intent1);
break;
case R.id.switch_bt2:
Intent intent2 = new Intent(MainActivity.this,ActivityB.class);
/*
intent2.putExtra("ActivityName","我是MainActivity!");
intent2.putExtra("Data",18);
*/
Bundle bundle = new Bundle();
bundle.putString("ActivityName","我是MainActivity(Bundle)!");
bundle.putInt("Data",18);
intent2.putExtras(bundle);
startActivity(intent2);
break;
case R.id.switch_bt3:
Intent intent3 = new Intent(MainActivity.this,ActivityC.class);
startActivityForResult(intent3,10001);
break;
default:
break;
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode,Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode==10001&&resultCode==10002){
String activityName = data.getStringExtra("BackInfo");
int backData = data.getIntExtra("Data",0);
switch_tv_main.setText(activityName+"\n\r回传了数据:"+backData);
}
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="当前为主界面MainActivity"
android:layout_above="@+id/switch_bt1"
android:layout_marginBottom="40dp"
android:textSize="30sp"
/>
<Button
android:id="@+id/switch_bt1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="跳转到界面A"
android:textSize="30sp"
android:layout_marginBottom="30dp"
/>
<Button
android:id="@+id/switch_bt2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="跳转并传数据到界面B"
android:layout_marginBottom="30dp"
android:textSize="30sp"
/>
<Button
android:id="@+id/switch_bt3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="跳转并传数据到界面C"
android:layout_marginBottom="30dp"
android:textSize="30sp"
/>
<TextView
android:id="@+id/switch_tv_main"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="这里存放界面C回传的数据"
android:textSize="30sp"
/>
</LinearLayout>
</RelativeLayout>
ActivityC.java
package com.yh.intenttest;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class ActivityC extends AppCompatActivity implements View.OnClickListener{
private Button bt_back;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_c);
initView();
}
private void initView(){
bt_back = findViewById(R.id.back_bt_c);
bt_back.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.back_bt_c:
Intent intent = new Intent(ActivityC.this,MainActivity.class);
intent.putExtra("BackInfo","我是ActivityC");
intent.putExtra("Data",19150307);
setResult(10002,intent);
finish();
break;
}
}
}
activity_c.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
tools:context=".ActivityB">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="这是ActivityC——界面C"
android:textSize="30sp"
android:layout_marginBottom="30dp"
/>
<Button
android:id="@+id/back_bt_c"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="返回原界面并回传数据"
android:textSize="30sp"
/>
</LinearLayout>
</RelativeLayout>
运行情况: