Intent的使用：显示调用及隐式调用_intent.setpackage-优快云博客

本文介绍了一个简单的 Android 应用程序实例，该应用通过显式和隐式 Intent 在 AActivity、BActivity 和 CActivity 三个 Activity 间进行跳转。显式 Intent 直接指定目标组件名称，而隐式 Intent 则通过 Action 和 Category 进行匹配。

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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>