Урок 30. Используем requestCode и resultCode в onActivityResult | Уроки Android Studio

Продолжаем изучать обмен данными между экранами android приложения. В этом уроке создаем android приложение, которое будет вызывать два разных Activity и получать от них данные. Как мы помним, результат приходит в метод onActivityResult. И requestCode используется, чтобы отличать друг от друга пришедшие результаты. А resultCode – позволяет определить, успешно прошел вызов или нет.

Исходный код классов из урока — под видео:

[pastacode lang=»css» message=»activity_main.xml» highlight=»» provider=»manual»]

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical">
    <TextView
        android:id="@+id/tvText"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:gravity="center_horizontal"
        android:text="Hello World"
        android:textSize="20sp">
    </TextView>
    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:orientation="horizontal">
        <Button
            android:id="@+id/btnColor"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginRight="5dp"
            android:layout_weight="1"
            android:text="Color">
        </Button>
        <Button
            android:id="@+id/btnAlign"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:layout_weight="1"
            android:text="Alignment">
        </Button>
    </LinearLayout>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout

xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical">

<TextView

android:id="@+id/tvText"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_marginTop="20dp"

android:gravity="center_horizontal"

android:text="Hello World"

android:textSize="20sp">

</TextView>

<LinearLayout

android:id="@+id/linearLayout1"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_margin="20dp"

android:orientation="horizontal">

<Button

android:id="@+id/btnColor"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginRight="5dp"

android:layout_weight="1"

android:text="Color">

</Button>

<Button

android:id="@+id/btnAlign"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginLeft="5dp"

android:layout_weight="1"

android:text="Alignment">

</Button>

</LinearLayout>

[/pastacode]

[pastacode lang=»java» message=»MainActivity.java» highlight=»» provider=»manual»]

package info.fandroid.activityresult;

import android.content.Intent;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    final int REQUEST_CODE_COLOR = 1;
    final int REQUEST_CODE_ALIGN = 2;

    TextView tvText;
    Button btnColor;
    Button btnAlign;

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

        tvText = (TextView)findViewById(R.id.tvText);

        btnColor = (Button)findViewById(R.id.btnColor);
        btnAlign = (Button)findViewById(R.id.btnAlign);

        btnAlign.setOnClickListener(this);
        btnColor.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        Intent intent;
        switch (v.getId()){
            case R.id.btnColor:
                intent = new Intent(this, ColorActivity.class);
                startActivityForResult(intent, REQUEST_CODE_COLOR);
                break;
            case R.id.btnAlign:
                intent = new Intent(this, AlignActivity.class);
                startActivityForResult(intent, REQUEST_CODE_ALIGN);
                break;
        }

    }

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

        Log.d("myLogs", "requestCode = " + requestCode + ", resultCode = " + resultCode);
        if (resultCode == RESULT_OK){
            switch (requestCode){
                case REQUEST_CODE_COLOR:
                    int color = data.getIntExtra("color", Color.WHITE);
                    tvText.setTextColor(color);
                    break;
                case REQUEST_CODE_ALIGN:
                    int align = data.getIntExtra("alignment", Gravity.LEFT);
                    tvText.setGravity(align);
                    break;
            }
        } else {
            Toast.makeText(MainActivity.this, "Wrong result", Toast.LENGTH_SHORT).show();
        }
    }
}

package info.fandroid.activityresult;

import android.content.Intent;

import android.graphics.Color;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

import android.view.Gravity;

import android.view.View;

import android.widget.Button;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

final int REQUEST_CODE_COLOR = 1;

final int REQUEST_CODE_ALIGN = 2;

TextView tvText;

Button btnColor;

Button btnAlign;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

tvText = (TextView)findViewById(R.id.tvText);

btnColor = (Button)findViewById(R.id.btnColor);

btnAlign = (Button)findViewById(R.id.btnAlign);

btnAlign.setOnClickListener(this);

btnColor.setOnClickListener(this);

}

@Override

public void onClick(View v) {

Intent intent;

switch (v.getId()){

case R.id.btnColor:

intent = new Intent(this, ColorActivity.class);

startActivityForResult(intent, REQUEST_CODE_COLOR);

break;

case R.id.btnAlign:

intent = new Intent(this, AlignActivity.class);

startActivityForResult(intent, REQUEST_CODE_ALIGN);

break;

}

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

super.onActivityResult(requestCode, resultCode, data);

Log.d("myLogs", "requestCode = " + requestCode + ", resultCode = " + resultCode);

if (resultCode == RESULT_OK){

switch (requestCode){

case REQUEST_CODE_COLOR:

int color = data.getIntExtra("color", Color.WHITE);

tvText.setTextColor(color);

break;

case REQUEST_CODE_ALIGN:

int align = data.getIntExtra("alignment", Gravity.LEFT);

tvText.setGravity(align);

break;

}

} else {

Toast.makeText(MainActivity.this, "Wrong result", Toast.LENGTH_SHORT).show();

}

[/pastacode]

[pastacode lang=»css» message=»activity_color.xml» highlight=»» provider=»manual»]

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="info.fandroid.activityresult.ColorActivity">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="red"
        android:id="@+id/btnRed"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="green"
        android:id="@+id/btnGreen"
        android:layout_alignTop="@+id/btnRed"
        android:layout_centerHorizontal="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="blue"
        android:id="@+id/btnBlue"
        android:layout_alignTop="@+id/btnGreen"
        android:layout_alignParentEnd="true" />
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:paddingBottom="@dimen/activity_vertical_margin"

android:paddingLeft="@dimen/activity_horizontal_margin"

android:paddingRight="@dimen/activity_horizontal_margin"

android:paddingTop="@dimen/activity_vertical_margin"

tools:context="info.fandroid.activityresult.ColorActivity">

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="red"

android:id="@+id/btnRed"

android:layout_alignParentTop="true"

android:layout_alignParentStart="true" />

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="green"

android:id="@+id/btnGreen"

android:layout_alignTop="@+id/btnRed"

android:layout_centerHorizontal="true" />

<Button

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="blue"

android:id="@+id/btnBlue"

android:layout_alignTop="@+id/btnGreen"

android:layout_alignParentEnd="true" />

</RelativeLayout>

[/pastacode]

[pastacode lang=»java» message=»ColorActivity.java» highlight=»» provider=»manual»]

package info.fandroid.activityresult;

import android.content.Intent;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class ColorActivity extends AppCompatActivity implements View.OnClickListener{

    Button btnRed;
    Button btnGreen;
    Button btnBlue;

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

        btnRed = (Button)findViewById(R.id.btnRed);
        btnGreen = (Button)findViewById(R.id.btnGreen);
        btnBlue = (Button)findViewById(R.id.btnBlue);

        btnRed.setOnClickListener(this);
        btnGreen.setOnClickListener(this);
        btnBlue.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        Intent intent = new Intent();
        switch (v.getId()){
            case R.id.btnRed:
                intent.putExtra("color", Color.RED);
                break;
            case R.id.btnGreen:
                intent.putExtra("color", Color.GREEN);
                break;
            case R.id.btnBlue:
                intent.putExtra("color", Color.BLUE);
                break;
        }
        setResult(RESULT_OK, intent);
        finish();

    }
}

package info.fandroid.activityresult;

import android.content.Intent;

import android.graphics.Color;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

public class ColorActivity extends AppCompatActivity implements View.OnClickListener{

Button btnRed;

Button btnGreen;

Button btnBlue;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_color);

btnRed = (Button)findViewById(R.id.btnRed);

btnGreen = (Button)findViewById(R.id.btnGreen);

btnBlue = (Button)findViewById(R.id.btnBlue);

btnRed.setOnClickListener(this);

btnGreen.setOnClickListener(this);

btnBlue.setOnClickListener(this);

}

@Override

public void onClick(View v) {

Intent intent = new Intent();

switch (v.getId()){

case R.id.btnRed:

intent.putExtra("color", Color.RED);

break;

case R.id.btnGreen:

intent.putExtra("color", Color.GREEN);

break;

case R.id.btnBlue:

intent.putExtra("color", Color.BLUE);

break;

}

setResult(RESULT_OK, intent);

finish();

}

[/pastacode]

[pastacode lang=»css» message=»activity_align.xml» highlight=»» provider=»manual»]

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="info.fandroid.activityresult.AlignActivity">

    <Button android:id="@+id/btnLeft" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentStart="true" android:layout_alignParentTop="true" android:text="Left" />

    <Button android:id="@+id/btnCenter" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/btnLeft" android:layout_centerHorizontal="true" android:text="Center" />

    <Button android:id="@+id/btnRight" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/btnCenter" android:layout_alignParentEnd="true" android:text="Right" />
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>

</RelativeLayout>

[/pastacode]

[pastacode lang=»java» message=»AlignActivity.java» highlight=»» provider=»manual»]

package info.fandroid.activityresult;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;

public class AlignActivity extends AppCompatActivity implements View.OnClickListener{

    Button btnLeft;
    Button btnCenter;
    Button btnRight;

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

        btnLeft = (Button)findViewById(R.id.btnLeft);
        btnCenter = (Button)findViewById(R.id.btnCenter);
        btnRight = (Button)findViewById(R.id.btnRight);

        btnLeft.setOnClickListener(this);
        btnCenter.setOnClickListener(this);
        btnRight.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        Intent intent = new Intent();
        switch (v.getId()){
            case R.id.btnLeft:
                intent.putExtra("alignment", Gravity.LEFT);
                break;
            case R.id.btnCenter:
                intent.putExtra("alignment", Gravity.CENTER);
                break;
            case R.id.btnRight:
                intent.putExtra("alignment", Gravity.RIGHT);
                break;
        }
        setResult(RESULT_OK, intent);
        finish();

    }
}

package info.fandroid.activityresult;

import android.content.Intent;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.Gravity;

import android.view.View;

import android.widget.Button;

public class AlignActivity extends AppCompatActivity implements View.OnClickListener{

Button btnLeft;

Button btnCenter;

Button btnRight;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_align);

btnLeft = (Button)findViewById(R.id.btnLeft);

btnCenter = (Button)findViewById(R.id.btnCenter);

btnRight = (Button)findViewById(R.id.btnRight);

btnLeft.setOnClickListener(this);

btnCenter.setOnClickListener(this);

btnRight.setOnClickListener(this);

}

@Override

public void onClick(View v) {

Intent intent = new Intent();

switch (v.getId()){

case R.id.btnLeft:

intent.putExtra("alignment", Gravity.LEFT);

break;

case R.id.btnCenter:

intent.putExtra("alignment", Gravity.CENTER);

break;

case R.id.btnRight:

intent.putExtra("alignment", Gravity.RIGHT);

break;

}

setResult(RESULT_OK, intent);

finish();

}

[/pastacode]

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