零基础Android学习笔记-03 窗口间的数据传递

1.通过全局变量来传递。

新建一个全局的类继承于Application

package com.example.helloworld;
 
import android.app.Application;
 
public class MyApp extends Application {
    public String passData;
 
    public String getPassData() {
        return passData;
    }
 
    public void setPassData(String passData) {
        this.passData = passData;
    }
 
    @Override
    public void onCreate() {
        // TODO Auto-generated method stub
        super.onCreate();
        setPassData("default");
    }
}

在首次展现的窗口中设置全局变量值。

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i(TAG, "onCreate被执行了.");
        button = (Button) this.findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
 
            @Override
            public void onClick(View v) {
                myapp = (MyApp) getApplication();
                myapp.setPassData("全局变量");
                Intent intent = new Intent(MainActivity.this,
                        OtherActivity.class);
                startActivity(intent);
            }
        });
    }

新建个窗体来接受全局变量值。

public class OtherActivity extends Activity {
    private MyApp myapp;
    private TextView textview;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.other);
        myapp=(MyApp)getApplication();
        String data=myapp.getPassData();
        textview=(TextView)this.findViewById(R.id.msg);
        textview.setText(data);
    }
}

然后在AndroidManifest.xml中配置下新的窗口，和全局变量名称

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.helloworld"
    android:versionCode="1"
    android:versionName="1.0" >
 
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />
 
    <application
        android:name="com.example.helloworld.MyApp"
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.helloworld.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name="com.example.helloworld.OtherActivity"></activity>
    </application>
 
</manifest>

OK，可以顺利传递全局变量数据。

2.通过剪切板来传递数据。