Android之Intent

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2018年02月05日 ⁄ 综合 ⁄ 共 4250字 ⁄ 字号小中大 ⁄ 评论关闭

一. 初步认识

src

Activity_01

package cn.android.lyj;

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

public class Activity_01 extends Activity {
	private static final int SHOW_EDITOR = 0;
	private EditText editText;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		editText = (EditText) findViewById(R.id.EditText01);

		Button button = (Button) findViewById(R.id.Button01);
		button.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				CharSequence text = editText.getText();

				Intent intent = new Intent(Activity_01.this, Activity_02.class);
				intent.putExtra("TEXT", text); // /将传送的数据放置在共同存储区，变量:TEXT
				startActivityForResult(intent, SHOW_EDITOR); // 切换到Activity，同时等待回应，设定requestCode=SHOW_EDITOR
			}
		});
	}

	// Main等待回应信息
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		if (requestCode == SHOW_EDITOR) {
			if (resultCode == RESULT_OK) {
				TextView textView = (TextView) findViewById(R.id.TextView02);
				textView.setText("RESULT_OK: "
						+ data.getCharSequenceExtra("TEXT"));
			}
		}
	}
}

Activity_02

package cn.android.lyj;

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

public class Activity_02 extends Activity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.sub);

		Button button = (Button) findViewById(R.id.Button01);
		final EditText editText = (EditText) findViewById(R.id.EditText01);

		// 取出变量，变量名称:TEXT
		Bundle extras = getIntent().getExtras();
		if (extras != null) {
			editText.setText(extras.getCharSequence("TEXT"));
		}

		// 设定Button01按钮的操作
		button.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				CharSequence text = editText.getText();

				Intent intent = new Intent(); // 将回传的数据放置在共同存储区，变量名称:TEXT
				intent.putExtra("TEXT", text);
				setResult(RESULT_OK, intent); // 回应信息，回到Activity_01的onActivityResult(),并告知处理响应结果resul							      // tCode是RESULT_OK
				
				finish(); // 结束Activity
			}
		});
	}
}

main.xml

<?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:layout_width="fill_parent" 
     	android:layout_height="wrap_content" 
      	android:id="@+id/TextView01" 
     	android:text="Activity_01传送下列信息给Activity_02"/>
    
    <EditText 
      android:id="@+id/EditText01" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" />
    
    <TextView android:id="@+id/TextView02" 
        android:layout_height="wrap_content"
         android:text="等Activity_02回应，显示来自Activity_02信息" 
         android:layout_width="fill_parent"/>
        
    <Button android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
         android:id="@+id/Button01" android:text="Go!" />

</LinearLayout>

sub.xml

<?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/TextView01" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
         android:text="Activity_02收到下列信息并回答RESULT_OK" />
        
    <EditText android:id="@+id/EditText01" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" />
    
    <Button android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:id="@+id/Button01" 
        android:text="RESULT_OK"/>

</LinearLayout>

Androidmanifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="cn.android.lyj"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:label="@string/app_name"
            android:name=".Activity_01" >
            <intent-filter >
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:label="@string/app_name"  android:name=".Activity_02" />
    </application>

</manifest>

二. 运行结果

启动后