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[Android] 클래스 이름 불러와 인텐트로 바로써먹어보자 본문

Android

[Android] 클래스 이름 불러와 인텐트로 바로써먹어보자

DeadDE 2018. 1. 22. 11:13

만들어두면 편할것같아서 구현함.


class의 이름을 String 으로 받고, intent시 바로 사용할수 있음.



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package com.example.user.android_activity_check;
 
import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
 
public class MainActivity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn = (Button)findViewById(R.id.btn_1);
        btn.setText("Main Activity");
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Class myClass_1 = null;
                try {
                    String myClass = new Activity_search(MainActivity.this).getRunActivity();
                    myClass_1 = Class.forName(myClass);
                    Activity obj = (Activity) myClass_1.newInstance();
                    Intent intent = new Intent(getApplicationContext(), Main2Activity.class);
                    startActivity(intent);
                } catch (ClassNotFoundException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                } catch (InstantiationException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}
 
 
 
package com.example.user.android_activity_check;
 
import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
 
 
 
public class Main2Activity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        Button btn = (Button) findViewById(R.id.btn_2);
        btn.setText("2Activity");
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Class myClass_1 = null;
                try {
                    String myClass = new Activity_search(Main2Activity.this).getRunActivity();
                    myClass_1 = Class.forName(myClass);
                    Activity obj = (Activity) myClass_1.newInstance();
                    Intent intent = new Intent(getApplicationContext(), Main3Activity.class);
                    startActivity(intent);
                } catch (ClassNotFoundException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                } catch (InstantiationException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}
 
 
package com.example.user.android_activity_check;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
 
public class Main3Activity extends AppCompatActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
    }
}
 
 
package com.example.user.android_activity_check;
 
import android.app.Activity;
import android.app.ActivityManager;
import android.content.ComponentName;
import android.content.Context;
 
import java.util.List;
 
 
/**
 * Created by USER on 2018-01-19.
 */
 
public class Activity_search {
    Activity act;
    public Activity_search(Activity activity){
        this.act = activity;
    }
    public String getRunActivity()    {
        ActivityManager activity_manager = (ActivityManager) act.getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.RunningTaskInfo> task_info = activity_manager.getRunningTasks(9999);
        ComponentName topActivity = task_info.get(0).topActivity;
        String className = topActivity.getClassName();
        return className;
    }
}
 
 
 
 cs


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