Android Studio: Cara Membuat Android Apps 6

In this tutorial I’ll show you how to fix Android Studio errors that you guys are having trouble with. I’ll also show how to pass objects between screens in Android.

I show how to set up Android Studio 0.8, show the files you need to install in the SDK Manager, and how to set up a working Android Virtual Device. I’ll also show how to fix the UIDs are inconsistent error. You can download Android Studio here. All the code used follows the tutorial below.

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All of the Code from the Video

This code is in addition to the code covered in part 5 of my How to Make Android Apps tutorial.

build.gradle

apply plugin: 'android'

android {
    compileSdkVersion 19
    buildToolsVersion '19.1.0'

    defaultConfig {
        minSdkVersion 14
        targetSdkVersion 19
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            runProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:19.+'
}

Human.java

package com.newthinktank.switchingscreens.app;

import java.io.Serializable;

public class Human implements Serializable{

    private double height, weight;
    private String name = "";

    public Human(double height, double weight, String name) {
        this.height = height;
        this.weight = weight;
        this.name = name;
    }

    public double getHeight() {
        return height;
    }

    public void setHeight(double height) {
        this.height = height;
    }

    public double getWeight() {
        return weight;
    }

    public void setWeight(double weight) {
        this.weight = weight;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

MainActivity.java

package com.newthinktank.switchingscreens.app;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
 

public class MainActivity extends ActionBarActivity {

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


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    public void onGetNameClick(View view) { 

        /*Intent getNameScreenIntent = new Intent(this,
                SecondScreen.class);*/

        final int result = 1;

        // getNameScreenIntent.putExtra("callingActivity", "MainActivity");

        Human bob = new Human(6.25, 185, "Bob");

        Intent sendBob = new Intent(this, SecondScreen.class);

        sendBob.putExtra("humanBob", bob);

        startActivityForResult(sendBob, result);

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        TextView usersNameMessage = (TextView)
                findViewById(R.id.users_name_message);

        String nameSentBack = data.getStringExtra("UsersName");

        usersNameMessage.append(" " + nameSentBack);

    }


}

SecondScreen.java

package com.newthinktank.switchingscreens.app;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
 

public class SecondScreen extends Activity{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.second_layout);

        Intent activityThatCalled = getIntent();

        // String previousActivity = activityThatCalled.getExtras().getString("callingActivity");

        Human bob = (Human) activityThatCalled.getSerializableExtra("humanBob");

        TextView callingActivityMessage = (TextView)
                findViewById(R.id.calling_activity_info_text_view);

        callingActivityMessage.append(bob.getName() + " " +
        bob.getHeight() + " ft " + bob.getWeight() + " lbs");
    }

    public void onSendUsersName(View view) {

        EditText usersNameET = (EditText)
                findViewById(R.id.users_name_edit_text);

        String usersName = String.valueOf(usersNameET.getText());

        Intent goingBack = new Intent(); 

        goingBack.putExtra("UsersName", usersName);

        setResult(RESULT_OK, goingBack);

        finish();
    }
}

Referensi

• http://www.newthinktank.com/2014/07/make-android-apps-6/
• http://www.newthinktank.com/2014/07/make-android-apps-6/#sthash.Sa8GzQnD.dpuf