Android中一个APP启动另一个APP并传递参数

被调用（启动）的APP：
项目名字：Demo_ybs
项目包名：com.ybs.demo_ybs
被调用APP中获取调用者的传递数据：

package com.ybs.demo_ybs;


import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends Activity {

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

        getAppData();
    }

private void getAppData() {

        Intent intent=getIntent();
if(intent.getFlags()==101){
            String data_str = intent.getStringExtra("data");
            Log.i("tag", data_str);
//tag: 调用者传递过来的数据

        }

    }



}

调用者APP：
项目名字：Demo1
项目包名：com.ybs.ymt
调用者APP中传递数据：

package com.ybs.ymt;

import android.os.Bundle;
import android.view.View;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;

public class MainActivity extends Activity {
private String reqData;

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

    }

private String setData() {
        reqData = "调用者传递过来的数据";
return reqData;
    }
//点击按钮后触发调用另一个APP
public void onClcik(View view) {
//要调用另一个APP的activity所在的包名
        String packageName = "com.ybs.demo_ybs";
//要调用另一个APP的activity名字
        String activity = "com.ybs.demo_ybs.MainActivity";
        ComponentName component = new ComponentName(packageName, activity);
        Intent intent = new Intent();
        intent.setComponent(component);
        intent.setFlags(101);
        intent.putExtra("data", setData());
        startActivity(intent);
    }

}

方法2：
被调用（启动）的APP：
项目名字：Demo_ybs
项目包名：com.ybs.demo_ybs
被调用APP中获取调用者的传递数据：

package com.ybs.demo_ybs;


import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;



public class MainActivity extends Activity {

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

        getAppData();
    }

private void getAppData() {

        Intent intent=getIntent();
if(intent.getFlags()==101){
//String data_str = intent.getStringExtra("data");
            Bundle bundle=intent.getExtras();
            String data_str = bundle.getString("data");
            Log.i("tag", data_str);

        }

    }

//点击按钮触发此事件
public void onClick(View view){
        Intent data = new Intent();  
//参数1：要调用另一个APP的activity所在的包名
//参数2：要调用另一个APP的activity名字
        data.setClassName("com.ybs.ymt", "com.ybs.ymt.MainActivity");
        data.putExtra("return_data", "回传给调用者的数据");  
        setResult(10, data); //设置返回数据 
this.finish(); //关闭当前Activity 
        Log.i("tag", "回传给调用者的数据");
    }


}

调用者APP：
项目名字：Demo1
项目包名：com.ybs.ymt
调用者APP中传递数据：

package com.ybs.ymt;


import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.app.Activity;
import android.app.ActivityManager;
import android.app.ActivityManager.RunningAppProcessInfo;
import android.app.KeyguardManager;
import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.PackageManager;

public class MainActivity extends Activity {
private String reqData;
private int IMPORTANCE_FOREGROUND=100;
private int IMPORTANCE_VISIBLE=130;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

    }




public void onClcik(View view) {


/*
 //此方法也可以去启动另一个APP
 Intent intent = new Intent();

 intent.setComponent(new ComponentName("com.ybs.demo_ybs", "com.ybs.demo_ybs.MainActivity"));

 if (!isBackgroundRunning()) {
 intent.setAction("android.intent.action.MAIN");
 intent.addCategory(Intent.CATEGORY_LAUNCHER);
 }

 intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);

 intent.putExtra("data", "调用者传递过来的数据aaa");

 startActivity(intent);*/

        Intent intent = new Intent();
        intent.setFlags(101);
        Bundle bundle = new Bundle();
        bundle.putString("data", "调用者传递过来的数据aaa");
        intent.putExtras(bundle);
//参数1：要调用另一个APP的activity所在的包名
//参数2：要调用另一个APP的activity名字
        intent.setClassName("com.ybs.demo_ybs", "com.ybs.demo_ybs.MainActivity");
        startActivityForResult(intent, 1);



    }





//在启动前进行一次判断：app是否在后台运行。一下是判断app是否运行的方法：
private boolean isBackgroundRunning() {
        String processName = "com.ybs.demo_ybs";
        ActivityManager activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
        KeyguardManager keyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);
if (activityManager == null)
return false;
// get running application processes
        List<ActivityManager.RunningAppProcessInfo> processList = activityManager
                .getRunningAppProcesses();
for (ActivityManager.RunningAppProcessInfo process : processList) {
/* 
 BACKGROUND=400 EMPTY=500 FOREGROUND=100 
 GONE=1000 PERCEPTIBLE=130 SERVICE=300 ISIBLE=200 
 */  
if (process.processName.startsWith(processName)) {
boolean isBackground = process.importance != RunningAppProcessInfo.IMPORTANCE_FOREGROUND
                        && process.importance != RunningAppProcessInfo.IMPORTANCE_VISIBLE;
boolean isLockedState = keyguardManager
                        .inKeyguardRestrictedInputMode();
if (isBackground || isLockedState)
return true;
else
return false;
            }
        }
return false;
    }


//此方法中可以接收另一个app回传回来的数据
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        Log.i("tag", "onActivityResult1");
if(resultCode == 10 && requestCode == 1){
            Log.i("tag", "onActivityResult2");

                String return_data=data.getStringExtra("return_data");

                Log.i("tag", "调用者返回的数据:" + return_data);

        }    
super.onActivityResult(requestCode, resultCode, data);
    }





}