1、点击空白处隐藏软键盘
/*
隐藏软键盘
* */
public boolean dispatchTouchEvent(MotionEvent ev) {
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
View v = getCurrentFocus();
if (isShouldHideInput(v, ev)) { InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
if (imm != null) {
imm.hideSoftInputFromWindow(v.getWindowToken(), 0);
}
}
return super.dispatchTouchEvent(ev);
} if (getWindow().superDispatchTouchEvent(ev)) {
return true;
}
return onTouchEvent(ev);
} public boolean isShouldHideInput(View v, MotionEvent event) {
if (v != null && (v instanceof EditText)) {
int[] leftTop = { 0, 0 }; v.getLocationInWindow(leftTop);
int left = leftTop[0];
int top = leftTop[1];
int bottom = top + v.getHeight();
int right = left + v.getWidth();
if (event.getX() > left && event.getX() < right
&& event.getY() > top && event.getY() < bottom) { } else {
return true;
}
}
return false;
}
2、沉浸式状态栏
//设置沉浸式状态栏 android 4.4 及以上支持
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
//透明状态栏
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
//透明导航栏
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION);
}
3、设置导航栏
xml代码：
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:background="#5caef9"
android:minHeight="50dp"
android:gravity="center"
android:textAlignment="center"
>
</android.support.v7.widget.Toolbar>
后台代码：
//设置导航栏
Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar1);//鑾峰彇椤甸潰鐨勫伐鍏锋爮 toolbar.setTitle("设置服务");
toolbar.setTitleMarginStart(370);
toolbar.setTitleTextColor(Color.WHITE);
toolbar.setTitleMarginTop(10);
toolbar.setNavigationIcon(R.mipmap.allback);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(SettingServiceActivity.this,MyselfLoginActivity.class);
startActivity(intent);
}
});
4、获取屏幕宽高和设置控件宽高
//设置输入框宽高
EditText tvservicepath = (EditText)findViewById(R.id.tvservicepath);
tvservicepath.setText(R.string.serverpath);//获取资源文件
//获取屏幕高宽
WindowManager wm = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics dm = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(dm);
int width = dm.widthPixels; // 屏幕宽度（像素）
int height = dm.heightPixels; // 屏幕高度（像素）
float density = dm.density; // 屏幕密度（0.75 / 1.0 / 1.5）
int densityDpi = dm.densityDpi; // 屏幕密度dpi（120 / 160 / 240）
// 屏幕宽度算法:屏幕宽度（像素）/屏幕密度
int screenWidth = (int) (width / density); // 屏幕宽度(dp)
int screenHeight = (int) (height / density);// 屏幕高度(dp) ViewGroup.LayoutParams para;
para = tvservicepath.getLayoutParams();
para.height = screenHeight/2;
para.width = width-50;
tvservicepath.setLayoutParams(para);
5、在手机本地保存数据和读取(参考：https://blog.csdn.net/acm_th/article/details/50009575)
<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="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.savedatademo.MainActivity" > <EditText
android:id="@+id/input"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入" /> <Button
android:id="@+id/btn1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/input"
android:text="保存数据" /> <Button
android:id="@+id/btn2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/btn1"
android:text="读取数据"/> </RelativeLayout>
package com.example.savedatademo; import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.util.Scanner; import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast; public class MainActivity extends Activity { private Button saveBtn = null;
private Button readBtn = null;
private EditText input = null;
private final static String FILE_NAME = "xth.txt"; // 设置文件的名称 @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main); input = (EditText) findViewById(R.id.input);
saveBtn = (Button) findViewById(R.id.btn1);
readBtn = (Button) findViewById(R.id.btn2); saveBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String data = input.getText().toString();
save(data);
Toast.makeText(MainActivity.this, "保存数据成功！", Toast.LENGTH_SHORT)
.show();
}
});
readBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
StringBuffer sb = read();
Toast.makeText(MainActivity.this, "读取数据为：" + sb,
Toast.LENGTH_SHORT).show();
}
});
} private StringBuffer read() {
FileInputStream in = null;
Scanner s = null;
StringBuffer sb = new StringBuffer();
try {
in = super.openFileInput(FILE_NAME);
s = new Scanner(in);
while (s.hasNext()) {
sb.append(s.next());
}
} catch (Exception e) {
e.printStackTrace();
}
return sb;
} private void save(String data) {
FileOutputStream out = null;
PrintStream ps = null;
try {
out = super.openFileOutput(FILE_NAME, Activity.MODE_APPEND);
ps = new PrintStream(out);
ps.println(data);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (out != null) {
try {
out.close();
ps.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
} }
这是追加内容的，如果覆盖，改成：
out = super.openFileOutput(FILE_NAME, Activity.MODE_WORLD_WRITEABLE);
6、代码设置按钮被点击使用performClick（）方法。
7、设置控件的显示与隐藏：
View缺省为可见的，在应用可以通过setVisibility 修改View的可见性，
View.VISIBLE View可见，View.INVISIBLE View不可以见，但仍然占据可见时的大小和位置。
View.GONE View不可见，且不占据空间。
