- Android程序設計-1html
安裝好虛擬環境
java
建立好helloworld項目
android
在AS左側找到res
-->layout
-->activity ...xml
中找到helloworld語句進行相應的修改git
修改helloworld
app
修改效果
ide
-Android程序設計-2佈局
新建項目
學習
修改代碼
測試
運行結果
ui
代碼:
ThirdActivity.java
package com.example.helloworld; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; public class ThirdActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_third); } }
activity_third.xml
<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout 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:orientation="vertical"> <TextView android:id="@+id/textView" android:layout_width="172dp" android:layout_height="139dp" android:text="20175334" tools:layout_editor_absoluteX="153dp" tools:layout_editor_absoluteY="311dp" tools:ignore="MissingConstraints" /> </android.support.constraint.ConstraintLayout>
AndroidMainifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" package="com.example.helloworld" > <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" tools:ignore="GoogleAppIndexingWarning"> <activity android:name=".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=".ThirdActivity" android:label="Activity"> </activity><!--在這裏註冊--> </application> </manifest>
MainActivity.java
package com.example.helloworld; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MainActivity extends Activity { private Button button1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button1 = (Button) findViewById(R.id.button1); button1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent( MainActivity.this, ThirdActivity.class); // 建立一個Intent對象 startActivity(intent); } }) ;} }
activity_main.xml
<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <Button android:id="@+id/button1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="啓動另外一個activity" tools:ignore="MissingConstraints" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Hello World!20175333" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" /> </android.support.constraint.ConstraintLayout>
-Android程序設計-3
修改代碼
運行結果
MainActivity.java
package com.example.helloworld; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Toast; public class MainActivity extends Activity { private Button button1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Toast toast=Toast.makeText(MainActivity.this, "20175333!!!",Toast.LENGTH_LONG); toast.show(); button1 = (Button) findViewById(R.id.button1); button1.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Intent intent = new Intent( MainActivity.this, ThirdActivity.class); // 建立一個Intent對象 startActivity(intent); } }) ;} }
-Android程序設計-4
界面設計
運行結果
-Android程序設計-5
MainActivity.java
package com.example.helloworld; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.app.Activity; import android.graphics.Color; import android.os.Bundle; import android.view.Menu; import android.view.View; import android.widget.AnalogClock; import android.app.Activity; import android.graphics.Color; import android.os.Bundle; import android.view.Menu; import android.view.View; import android.widget.AnalogClock; import com.example.helloworld.R; public class MainActivity extends Activity { int counter = 0; int[] colors = { Color.BLACK, Color.BLUE, Color.CYAN, Color.DKGRAY, Color.GRAY, Color.GREEN, Color.LTGRAY, Color.MAGENTA, Color.RED, Color.WHITE, Color.YELLOW }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_main, menu); return true; } public void changeColor(View view) { if (counter == colors.length) { counter = 0; } view.setBackgroundColor(colors[counter++]); } }
activity_main
<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <Button android:id="@+id/button1" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="啓動另外一個activity" tools:ignore="MissingConstraints" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginEnd="80dp" android:layout_marginRight="80dp" android:text="Hello 20175333" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" tools:text="Hello World!20175333" /> <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="10dp" android:paddingLeft="10dp" android:paddingRight="10dp" android:paddingTop="10dp" tools:context=".MainActivity"> <AnalogClock android:id="@+id/analogClock1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:layout_marginTop="90dp" android:onClick="changeColor" /> </RelativeLayout> </android.support.constraint.ConstraintLayout>