Application全局应用

最新推荐文章于 2025-08-14 19:04:22 发布

转载最新推荐文章于 2025-08-14 19:04:22 发布 · 68 阅读

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原文链接：https://my.oschina.net/u/1414017/blog/537309

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#移动开发 #python

本文详细介绍了Android应用开发过程中的关键步骤，包括使用XML布局文件进行界面设计、通过Java或Kotlin编写业务逻辑，以及如何将应用打包并发布到Google Play Store。同时，文章还涉及了使用AndroidManifest.xml配置应用权限、依赖管理、资源优化等内容，帮助开发者更高效地完成应用开发。

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main1

public class MainActivity extends AppCompatActivity {
    private Button button;
    private TextView textView;
    private EditText editText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button)findViewById(R.id.button);
        textView = (TextView)findViewById(R.id.textView2);
        editText = (EditText)findViewById(R.id.editText);
        textView.setText("share:" + getApp().getTextData());

        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ((App)getApplicationContext()).setTextData(editText.getText().toString());
                textView.setText("share:"+editText.getText().toString());
            }
        });
    }
    public App getApp() {
        return (App) getApplicationContext();
    }
}

2.main2

public class Main2Activity extends AppCompatActivity {

    private Button button;
    private TextView textView;
    private EditText editText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        button = (Button)findViewById(R.id.button);
        textView = (TextView)findViewById(R.id.textView2);
        editText = (EditText)findViewById(R.id.editText);
        textView.setText("share:" + getApp().getTextData());
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ((App) getApplicationContext()).setTextData(editText.getText().toString());
                textView.setText("share:" + editText.getText().toString());
            }
        });
    }

    public App getApp() {
        return (App) getApplicationContext();
    }
}

3. AndroidMainfest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.tianc.player.secondactivity" >

    <application
        android:name=".App"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme" >
        <activity android:name=".MainActivity"
            android:label="main1">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".Main2Activity"
            android:label="main2">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

4. xml1

<?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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">



    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="safe"
        android:id="@+id/button"
        android:layout_below="@+id/editText"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Text"
        android:id="@+id/textView2"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
   />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/editText"
        android:layout_below="@+id/textView2"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
</RelativeLayout>

5.xml2

<?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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">



    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="safe"
        android:id="@+id/button"
        android:layout_below="@+id/editText"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Text"
        android:id="@+id/textView2"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/editText"
        android:layout_below="@+id/textView2"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
</RelativeLayout>

转载于:https://my.oschina.net/u/1414017/blog/537309