1.基础操作
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView android:id="@+id/text_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="This is a textView"
android:gravity="center"
android:textSize="24sp"
android:textColor="#00ff00" />
</LinearLayout>
2. 为按钮添加事件处理
public class MainActivity extends Activity implements OnClickListener {
@Override
public void onClick(View v) {
switch(v.getId()) {
case R.id.button:
break;
default:
break;
}
}
}
3. 输入框
<EditText android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Type something here"
android:maxLines="2"
android:id="@+id/editText"/>
.java
private EditText editText;
editText = (EditText) findViewById(R.id.editText);
String inputText = editText.getText().toString();
4. ImageView
<ImageView
android:id="@+id/image_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher"
/>
.java
imageView,setImageResource(R.drawable.jelly_bean)
5.进度条
<ProgressBar
...
/>
通过设置控件的android:visibility属性来控制控件的可见性。
可选值：
- visible
- invisible
- gone
可以通过方法：
setVisibility()设置可见性，可以传入View.VISIBLE，View.INVISIBLE，View.GONE
通过方法： getVisibility()方法获取状态
可以设置成水平进度条
style="?android:attr/progressBarStyleHorizontal"
android:max = "100" #设置最大值
获取进度值
int progress = progressBar.getProgress();
progress = progress + 10;
progressBar.setProgress(progress);
6. AlertDialog
AlertDialog.Builder dialog = new AlertDialog.Builder(MainActivity.this);
dialog.setTitle("This is Dialog");
dialog.setMessage("something import.");
dialog.setCancelable(false);
dialog.setPositiveButton("OK", new DialogInterface.OnClickLinstener(){
@Override
publlic void onClick(DialogInterface dialog, int which) {
}
});
dialog.setNegativeButton("Cancel", new DialogInterface.OnClickListenser() {
@Override void onClick(DialogInterface dialog, int which) {
}
});
dialog.show();
7. ProgressDialog
ProgressDialog progressDialog = new ProgressDialog(MainActivity.this);
progressDialog.setTitle("This is a Progressdialog");
progressDialog.setMessage("Loading...");
progressDialog.setCancelable(true);
progressDialog.show();
#如果设置setCancelable(false),要通过dismiss方法来关闭对话框
