Android-将startActivityForResult方

项目地址：https://github.com/QiaokeZ/Android_activity

1.ActivityInfo类

public class ActivityInfo {
    public Intent intent; //需要启动的Intent
    public int requestCode; //请求码
    public OnResultListener listener; //回调

    public ActivityInfo(Intent intent, int requestCode, OnResultListener listener) {
        this.intent = intent;
        this.requestCode = requestCode;
        this.listener = listener;
    }
}

2.OnResultListener接口

public interface OnResultListener {
    void onResult(int requestCode, int resultCode, Intent data);
}

3.ActivityManager类

public class ActivityManager {

    private static ActivityManager singleInstance;
    private Map<String, ActivityInfo> map = new HashMap();

    public static ActivityManager getInstance() {
        if (singleInstance == null) {
            synchronized (ActivityManager.class) {
                if (singleInstance == null) {
                    singleInstance = new ActivityManager();
                }
            }
        }
        return singleInstance;
    }

    private ActivityManager() {

    }

    public void startActivityForResult(Activity activity, String identifier, Intent intent, int requestCode, OnResultListener listener) {
        activity.startActivityForResult(intent, requestCode);
        ActivityInfo info = new ActivityInfo(intent, requestCode, listener);
        map.put(identifier, info);
    }

    public void finishWithResult(Activity activity, String identifier, int resultCode, Intent data) {
        activity.setResult(resultCode, data);
        activity.finish();
        ActivityInfo info = map.get(identifier);
        if (null != info){
            info.listener.onResult(info.requestCode, resultCode, data);
            map.remove(identifier);
        }
    }

    public void finish(Activity activity, String identifier) {
        activity.finish();
        ActivityInfo info = map.get(identifier);
        if (null != info){
            map.remove(identifier);
        }
    }
}

测试MainActivity

public class MainActivity extends AppCompatActivity {

    private TextView tv1;
    private TextView tv2;
    private TextView tv3;
    public static final String TAG = "MainActivity";

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

        tv1 = findViewById(R.id.tv1);
        tv2 = findViewById(R.id.tv2);
        tv3 = findViewById(R.id.tv3);

        findViewById(R.id.btn1).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                Intent intent = new Intent(MainActivity.this, SecondActivity.class);
                //启动SecondActivity
                ActivityManager.getInstance().startActivityForResult(MainActivity.this, TAG, intent, 100, new OnResultListener() {
                    @Override
                    public void onResult(int requestCode, int resultCode, Intent data) {
                        tv1.setText(requestCode + "");
                        tv2.setText(resultCode + "");
                        tv3.setText(data.getStringExtra("key"));
                    }
                });
            }
        });

        findViewById(R.id.btn2).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                tv1.setText("");
                tv2.setText("");
                tv3.setText("");
            }
        });
    }
}

测试SecondActivity

public class SecondActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        findViewById(R.id.btn1).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.putExtra("key", "test");
                ActivityManager.getInstance().finishWithResult(SecondActivity.this, MainActivity.TAG, 200, intent);
            }
        });
    }

    @Override
    public void onBackPressed() {
        ActivityManager.getInstance().finish(this, MainActivity.TAG);
    }
}