app中启动其他app

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核心部分

启动一个app，主要是通过startActivity打开对应的包：

                PackageManager packageManager = getPackageManager();
                Intent intent = packageManager.getLaunchIntentForPackage("com.exmple.helloapp");
//                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                startActivity(intent);

通过packageManager 获取包的信息。必须保证包已经安装过了。

实战代码

MainActivity.java:

package com.exmple.startapp;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

/**
 * @author Lee
 */
public class MainActivity extends AppCompatActivity {
    Button button;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button = (Button)findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                PackageManager packageManager = getPackageManager();
                Intent intent = packageManager.getLaunchIntentForPackage("com.exmple.helloapp");
//                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                startActivity(intent);
            }
        });
    }
}