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<EditText
     <!-- 设置密码框 -->
     android:password="true"
</EditText>
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CheckBox cb;
if (cb.isChecked()) { ... }
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//获取文本
((EditText)findViewById(R.id.editText2)).getText().toString()
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//设置按钮事件
b1=(Button)findViewById(R.id.button);
b1.setOnClickListener( new View.OnClickListener() {
  
    @Override
    public void onClick(View v) {
       // 用浏览器打开网址
        Intent i = new Intent(android.content.Intent.ACTION_VIEW, Uri.parse("http://www.uprogrammer.cn"));

        // 拨号
        //Intent i = new Intent(android.content.Intent.ACTION_VIEW,Uri.parse("tel:9510300000"));

        startActivity(i);
    }
});
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<!-- 通过Launch或者Intent调用 -->
<intent-filter>
      <action android:name="android.intent.action.VIEW" />
      <action android:name="com.example.MyApplication.LAUNCH" />
      <category android:name="android.intent.category.DEFAULT" />
      <data android:scheme="http" />
</intent-filter>
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 <!-- 监听网址的打开（Manifest） -->
<activity android:name="cn.uprogrammer.intentfilter.CustomActivity"
          android:label="@string/app_name">
    <intent-filter>
        <action android:name="android.intent.action.VIEW" />
        <action android:name="cn.uprogrammer.intentfilter.LAUNCH" />
        <category android:name="android.intent.category.DEFAULT" />
        <data android:scheme="http" />
    </intent-filter>
</activity>
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// 监听打开网址后（显示网址）
public class CustomActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.custom_view);
      
        TextView label = (TextView) findViewById(R.id.show_data);
        Uri url = getIntent().getData();
        label.setText(url.toString());
    }
}

文本框属性详解 http://www.runoob.com/w3cnote/android-tutorial-textview.html

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Drawable drawable = MainActivity.this.getResources().getDrawable(R.drawable.picture1);
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// 格式化文本，"常量%1常量"
textView.setText(getString(R.string.section_format, 123));

<string name="section_format">Hello World %1$d</string>
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// 规定ImageView最大值无效，需要加上下面这句：
android:adjustViewBounds
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// 判断版本号
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M)
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// 是否拥有联系人权限，没有就尝试获取
private boolean mayRequestContacts() {
    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
        return true;
    }
    if (checkSelfPermission(READ_CONTACTS) == PackageManager.PERMISSION_GRANTED) {
        return true;
    }
    if (shouldShowRequestPermissionRationale(READ_CONTACTS)) {
        Snackbar.make(mEmailView, R.string.permission_rationale, Snackbar.LENGTH_INDEFINITE)
            .setAction(android.R.string.ok, new View.OnClickListener() {
                @Override
                @TargetApi(Build.VERSION_CODES.M)
                public void onClick(View v) {
                    requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);
                }
            });
    } else {
        requestPermissions(new String[]{READ_CONTACTS}, REQUEST_READ_CONTACTS);
    }
    return false;
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions,
                                       @NonNull int[] grantResults) {
    if (requestCode == REQUEST_READ_CONTACTS) {
        if (grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            populateAutoComplete();
        }
    }
}
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// 设置 Spinner 下拉菜单
String[] ctype = new String[]{"全部", "游戏", "电影", "娱乐", "图书"};
//创建一个数组适配器
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, ctype);
//设置下拉列表框的下拉选项样式
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

Spinner spinner = super.findViewById(R.id.spinner);
spinner.setAdapter(adapter);