自己写的第一个安卓Android入门练习程序，记录一下.
练习点：
- 安卓代码风格
- Listener控件
- Activity切换
- Activity传值(通过Intent，还可以通过Intent+Bundle)
- AndroidManifest注册Activity
- AlertDialog.Builder消息框
MainInterface.java
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package cn.MetaNetworks.weatherreport;
import android.content.Intent;
import android.support.annotation.Nullable;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainInterface extends AppCompatActivity {
public Button yes_button;
public int resultCode;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_interface);
yes_button=(Button) this.findViewById(R.id.yes_button);
//add listener
yes_button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent(MainInterface.this,Login.class);
startActivityForResult(intent,1);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode==1){
//2表明有数据
new AlertDialog.Builder(MainInterface.this).setTitle("确认").setMessage("没有返回值.")
.setPositiveButton("确定",null)
.setNegativeButton("不是也得是",null)
.setNeutralButton("肯定是",null)
.show();
}
else if (resultCode==2){
//2表明有数据
assert data != null;
resultCode=data.getIntExtra("resultCode",-1);
new AlertDialog.Builder(MainInterface.this).setTitle("确认").setMessage("返回值为"+String.valueOf(resultCode)+".")
.setPositiveButton("确定",null)
.setNegativeButton("不是也得是",null)
.setNeutralButton("肯定是",null)
.show();
}
}
}
Login.java
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package cn.MetaNetworks.weatherreport;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
public class Login extends AppCompatActivity {
Button backButton;
Button okButton;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.result);
backButton=findViewById(R.id.backbutton);
okButton=findViewById(R.id.okbutton);
backButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//Intent intent=new Intent(Login.this,MainInterface.class);
//startActivity(intent);
setResult(1);
Login.this.finish();
}
});
okButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent=new Intent();
intent.putExtra("resultCode",2);
setResult(2,intent);
Login.this.finish();
}
});
}
}
AndroidManifest.xml
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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="cn.MetaNetworks.weacherreport">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainInterface">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Login"></activity>>
</application>
</manifest>
activity_main_interface.xml
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<?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=".MainInterface">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="16dp"
android:text="hq牛逼！！！"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/yes_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:text="YES!"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.507"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.659" />
</android.support.constraint.ConstraintLayout>
result.xml
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<?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">
<ImageView
android:id="@+id/imageView"
android:layout_width="281dp"
android:layout_height="269dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.093"
app:srcCompat="@mipmap/ic_launcher_round"
tools:srcCompat="@tools:sample/avatars" />
<EditText
android:id="@+id/editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:ems="10"
android:inputType="textPersonName"
android:text="Name"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.503"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.594" />
<EditText
android:id="@+id/editText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:ems="10"
android:inputType="textPassword"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.503"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.759" />
<LinearLayout
android:layout_width="268dp"
android:layout_height="64dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
android:orientation="horizontal"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.496"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.904">
<Button
android:id="@+id/okbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="确定" />
<Button
android:id="@+id/backbutton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="返回" />
</LinearLayout>
</android.support.constraint.ConstraintLayout>
