Intent的使用：显示调用及隐式调用

package com.zdsoft.launchmode1201;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class AActivity extends AppCompatActivity {
private Button bt_zhi, bt_yin;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_a);
initView();
//Intent调用
bt_zhi.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setClass(AActivity.this, BActivity.class);
startActivity(intent);
}
});
//Intent隐式调用
bt_yin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setPackage("com.zdsoft.launchmode1201");
intent.setAction("com.zhidi.actoin.MAP");
intent.addCategory("android.intent.category.APP_MAPS");
startActivity(intent);
}
});
}

private void initView() {
bt_zhi = (Button) findViewById(R.id.bt_zhi);
bt_yin = (Button) findViewById(R.id.bt_yin);
}
}

package com.zdsoft.launchmode1201;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class BActivity extends AppCompatActivity {
private Button bt_b;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_b);

initView();
bt_b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(BActivity.this,CActivity.class);
startActivity(intent);
}
});
}
private void initView(){
bt_b= (Button) findViewById(R.id.bt_b);
}
}

package com.zdsoft.launchmode1201;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class CActivity extends AppCompatActivity {
private Button bt_c;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_c);
initView();
bt_c.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(CActivity.this,AActivity.class);
startActivity(intent);
}
});
}
private void initView(){
bt_c= (Button) findViewById(R.id.bt_c);
}

}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/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"
android:orientation="vertical"
android:gravity="center">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="A页面" />
<Button
android:id="@+id/bt_zhi"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="直接调用"/>
<Button
android:id="@+id/bt_yin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="隐式调用"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/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"
android:orientation="vertical"
android:gravity="center">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="B页面" />
<Button
android:id="@+id/bt_b"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="下一步"/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/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"
android:orientation="vertical"
android:gravity="center">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="C页面" />
<Button
android:id="@+id/bt_c"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="完成"/>
</LinearLayout>